The Legend of the lost keys is an educational BBC Look and Read production, which was first aired on BBC Two on 12 January 1998, and has been shown regularly ever since.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | The Lost Treasure Part One | 1967-01-09 | 20 min |
| Season 1 | Episode 2 | The Lost Treasure Part Two | 1967-01-16 | 20 min |
| Season 1 | Episode 3 | The Lost Treasure Part Three | 1967-01-23 | 20 min |
| Season 1 | Episode 4 | The Lost Treasure Part Four | 1967-01-30 | 20 min |
| Season 1 | Episode 5 | The Lost Treasure Part Five | 1967-02-06 | 20 min |
| Season 1 | Episode 6 | The Lost Treasure Part Six | 1967-02-13 | 20 min |
| Season 1 | Episode 7 | The Stolen Treasure Part One | 1967-02-20 | 20 min |
| Season 1 | Episode 8 | The Stolen Treasure Part Two | 1967-02-27 | 20 min |
| Season 1 | Episode 9 | The Stolen Treasure Part Three | 1967-03-06 | 20 min |
| Season 1 | Episode 10 | The Stolen Treasure Part Four | 1967-03-13 | 20 min |
| Season 2 | Episode 1 | A Job in the Docks | 1968-01-15 | 25 min |
| Season 2 | Episode 2 | The Dutch Doll | 1968-01-22 | 25 min |
| Season 2 | Episode 3 | The Missing Crate | 1968-01-29 | 19 min |
| Season 2 | Episode 4 | The Big Job | 1968-02-05 | 19 min |
| Season 2 | Episode 5 | Captain Grenko | 1968-02-12 | 19 min |
| Season 2 | Episode 6 | Is Len a Thief? | 1968-02-26 | 19 min |
| Season 2 | Episode 7 | This Way Up | 1968-03-04 | 19 min |
| Season 2 | Episode 8 | Tied and Gagged | 1968-03-11 | 19 min |
| Season 2 | Episode 9 | Find the S.S. Samba | 1968-03-18 | 19 min |
| Season 2 | Episode 10 | After Them! | 1968-03-25 | 19 min |
| Season 3 | Episode 1 | The Meteorite | 1971-09-21 | 19 min |
| Season 3 | Episode 2 | The Spinning Compass | 1971-09-28 | 19 min |
| Season 3 | Episode 3 | The Man in the Sandpit | 1971-10-05 | 19 min |
| Season 3 | Episode 4 | !regnaD nI (In Danger!) | 1971-10-12 | 19 min |
| Season 3 | Episode 5 | The Hold-up | 1971-10-19 | 19 min |
| Season 3 | Episode 6 | Where is Tom? | 1971-11-02 | 19 min |
| Season 3 | Episode 7 | The Hunt for the Car | 1971-11-09 | 19 min |
| Season 3 | Episode 8 | The Lake | 1971-11-16 | 19 min |
| Season 3 | Episode 9 | Captured! | 1971-11-23 | 19 min |
| Season 3 | Episode 10 | In the Space-ship | 1971-11-30 | 19 min |
| Season 4 | Episode 1 | Castle Farm | 1973-01-16 | 19 min |
| Season 4 | Episode 2 | Blackmail | 1973-01-23 | 19 min |
| Season 4 | Episode 3 | A Mistake? | 1973-01-30 | 19 min |
| Season 4 | Episode 4 | One in Three | 1973-02-06 | 19 min |
| Season 4 | Episode 5 | Never Say Die | 1973-02-13 | 19 min |
| Season 4 | Episode 6 | Prisoner in the House | 1973-02-27 | 19 min |
| Season 4 | Episode 7 | The Red Trail | 1973-03-06 | 19 min |
| Season 4 | Episode 8 | Left to Rot | 1973-03-13 | 19 min |
| Season 4 | Episode 9 | Put Up Your Hands | 1973-03-20 | 19 min |
| Season 4 | Episode 10 | The Hero | 1973-03-27 | 19 min |
| Season 5 | Episode 1 | Out of Control | 1974-09-24 | 19 min |
| Season 5 | Episode 2 | Ram Pandit | 1974-10-01 | 19 min |
| Season 5 | Episode 3 | RAV1 | 1974-10-08 | 19 min |
| Season 5 | Episode 4 | The Gas Gun | 1974-10-15 | 19 min |
| Season 5 | Episode 5 | In the Hut | 1974-10-22 | 19 min |
| Season 5 | Episode 6 | The Secret | 1974-11-05 | 19 min |
| Season 5 | Episode 7 | To the Mill! | 1974-11-12 | 19 min |
| Season 5 | Episode 8 | The Signal | 1974-11-19 | 19 min |
| Season 5 | Episode 9 | Escape | 1974-11-26 | 19 min |
| Season 5 | Episode 10 | Fire the Rockets! | 1974-12-03 | 19 min |
| Season 6 | Episode 1 | Boy Finds Message | 1977-01-11 | 19 min |
| Season 6 | Episode 2 | Questions at the Castle | 1977-01-18 | 19 min |
| Season 6 | Episode 3 | What is King's Dragon? | 1977-01-25 | 19 min |
| Season 6 | Episode 4 | Miss Wood in Danger? | 1977-02-01 | 19 min |
| Season 6 | Episode 5 | Mr Day Helps with Story | 1977-02-08 | 19 min |
| Season 6 | Episode 6 | Greed for Gold | 1977-02-22 | 19 min |
| Season 6 | Episode 7 | Editor Asks for Proof | 1977-03-01 | 19 min |
| Season 6 | Episode 8 | Run-Round in Old Town | 1977-03-08 | 19 min |
| Season 6 | Episode 9 | Archaeologist Digs Again! | 1977-03-15 | 19 min |
| Season 6 | Episode 10 | Banner Headlines! | 1977-03-22 | 19 min |
| Season 7 | Episode 1 | Strangers on the Canal | 1978-09-19 | 19 min |
| Season 7 | Episode 2 | For Sale | 1978-09-26 | 19 min |
| Season 7 | Episode 3 | The Birdman | 1978-10-03 | 19 min |
| Season 7 | Episode 4 | Are They Crooks? | 1978-10-10 | 19 min |
| Season 7 | Episode 5 | The Welsh Telegram | 1978-10-17 | 19 min |
| Season 7 | Episode 6 | Proof at Last | 1978-10-24 | 19 min |
| Season 7 | Episode 7 | A Friend in Need | 1978-11-07 | 19 min |
| Season 7 | Episode 8 | Where's Jackie? | 1978-11-14 | 19 min |
| Season 7 | Episode 9 | Who Can Be Trusted? | 1978-11-21 | 19 min |
| Season 7 | Episode 10 | Back to the Wild | 1978-11-28 | 19 min |
| Season 8 | Episode 1 | The Meteorite | 1980-01-15 | 19 min |
| Season 8 | Episode 2 | The Spinning Compass | 1980-01-22 | 19 min |
| Season 8 | Episode 3 | The Man in the Sand-Pit | 1980-01-29 | 19 min |
| Season 8 | Episode 4 | In Danger! | 1980-02-05 | 19 min |
| Season 8 | Episode 5 | The Hold-Up | 1980-02-12 | 19 min |
| Season 8 | Episode 6 | Where is Tom? | 1980-02-26 | 19 min |
| Season 8 | Episode 7 | The Hunt for the Car | 1980-03-04 | 19 min |
| Season 8 | Episode 8 | The Lake | 1980-03-11 | 19 min |
| Season 8 | Episode 9 | Captured! | 1980-03-18 | 19 min |
| Season 8 | Episode 10 | In the Space-Ship | 1980-03-25 | 19 min |
| Season 9 | Episode 1 | Dark Towers in Danger! | 1981-09-22 | 19 min |
| Season 9 | Episode 2 | The Man in the Picture | 1981-09-29 | 19 min |
| Season 9 | Episode 3 | The Old Legend | 1981-10-06 | 19 min |
| Season 9 | Episode 4 | The Clue in the Book | 1981-10-13 | 19 min |
| Season 9 | Episode 5 | The Old Coach House | 1981-10-20 | 19 min |
| Season 9 | Episode 6 | The Tall Knight's Folly | 1981-11-03 | 19 min |
| Season 9 | Episode 7 | The Dark Tree | 1981-11-10 | 19 min |
| Season 9 | Episode 8 | Beware of the Bird! | 1981-11-17 | 19 min |
| Season 9 | Episode 9 | Who Can Help? | 1981-11-24 | 19 min |
| Season 9 | Episode 10 | The Last Laugh | 1981-12-01 | 19 min |
| Season 10 | Episode 1 | Trouble in the Tea-Leaves | 1983-01-11 | 19 min |
| Season 10 | Episode 2 | Comings and Goings | 1983-01-18 | 19 min |
| Season 10 | Episode 3 | Hired Hands | 1983-01-25 | 19 min |
| Season 10 | Episode 4 | In the Dark | 1983-02-01 | 19 min |
| Season 10 | Episode 5 | Come to the Fair! | 1983-02-08 | 19 min |
| Season 10 | Episode 6 | Where is Rachel? | 1983-02-15 | 19 min |
| Season 10 | Episode 7 | Ozzie Thinks Again | 1983-03-01 | 19 min |
| Season 10 | Episode 8 | A Piece of Cake! | 1983-03-08 | 19 min |
| Season 10 | Episode 9 | Talk or Ride… | 1983-03-15 | 19 min |
| Season 10 | Episode 10 | Mixed Fortunes | 1983-03-22 | 19 min |
| Season 11 | Episode 1 | Sounds in the Night | 1984-09-18 | 19 min |
| Season 11 | Episode 2 | Stripey the Badger | 1984-09-25 | 19 min |
| Season 11 | Episode 3 | Running Away | 1984-10-02 | 19 min |
| Season 11 | Episode 4 | The Badgerman | 1981-10-09 | 19 min |
| Season 11 | Episode 5 | Lost on the Moor | 1984-10-16 | 19 min |
| Season 11 | Episode 6 | The Secret Passage | 1984-10-30 | 19 min |
| Season 11 | Episode 7 | Mick's Map | 1984-11-06 | 19 min |
| Season 11 | Episode 8 | Finding the Ponies | 1984-11-13 | 19 min |
| Season 11 | Episode 9 | Panic on the Lake | 1984-11-20 | 19 min |
| Season 11 | Episode 10 | Stripey the Superbadger | 1984-11-27 | 19 min |
| Season 12 | Episode 1 | Runners and Fliers | 1988-01-12 | 19 min |
| Season 12 | Episode 2 | Down in the Cellars | 1988-01-19 | 19 min |
| Season 12 | Episode 3 | Pigeon Post | 1988-01-26 | 19 min |
| Season 12 | Episode 4 | 'This is Radio Newcastle' | 1988-02-02 | 19 min |
| Season 12 | Episode 5 | Race Day | 1988-01-09 | 19 min |
| Season 12 | Episode 6 | Light of St Mary | 1988-02-16 | 19 min |
| Season 12 | Episode 7 | Lost Bird | 1988-03-01 | 19 min |
| Season 12 | Episode 8 | 'Have You Gone Daft, Man?' | 1988-03-08 | 19 min |
| Season 12 | Episode 9 | 'If Only We Knew When…' | 1988-03-15 | 19 min |
| Season 12 | Episode 10 | Run! | 1988-03-22 | 19 min |
| Season 13 | Episode 1 | The Dragon from Pelamar | 1989-09-19 | 19 min |
| Season 13 | Episode 2 | Flight to Widge | 1989-09-26 | 19 min |
| Season 13 | Episode 3 | The First Veeton | 1989-10-03 | 19 min |
| Season 13 | Episode 4 | Word Magic | 1989-10-10 | 19 min |
| Season 13 | Episode 5 | Clues in the Snow | 1989-10-17 | 19 min |
| Season 13 | Episode 6 | Jenny's Scarf | 1989-10-31 | 19 min |
| Season 13 | Episode 7 | The Waterfall of Words | 1989-11-07 | 19 min |
| Season 13 | Episode 8 | The Great Battle | 1989-11-14 | 19 min |
| Season 13 | Episode 9 | Danger on High! | 1989-11-21 | 19 min |
| Season 13 | Episode 10 | The Final Page | 1989-11-28 | 19 min |
| Season 14 | Episode 1 | Strangers on the Canal | 1992-01-14 | 19 min |
| Season 14 | Episode 2 | For Sale | 1992-01-21 | 19 min |
| Season 14 | Episode 3 | The Birdman | 1992-01-28 | 19 min |
| Season 14 | Episode 4 | Too Many Crooks | 1992-02-04 | 19 min |
| Season 14 | Episode 5 | The Welsh Telegram | 1992-02-11 | 19 min |
| Season 14 | Episode 6 | Proof at Last! | 1992-02-18 | 19 min |
| Season 14 | Episode 7 | A Friend in Need | 1992-03-03 | 19 min |
| Season 14 | Episode 8 | Where is Jackie? | 1992-03-10 | 19 min |
| Season 14 | Episode 9 | Trim's Tricks | 1992-03-17 | 19 min |
| Season 14 | Episode 10 | Back to the Wild | 1992-03-24 | 19 min |
| Season 15 | Episode 1 | It Came from Outer Space | 1994-01-11 | 19 min |
| Season 15 | Episode 2 | An Uninvited Guest | 1994-01-18 | 19 min |
| Season 15 | Episode 3 | Whoops! | 1994-01-25 | 19 min |
| Season 15 | Episode 4 | Code Name Charley | 1994-02-01 | 19 min |
| Season 15 | Episode 5 | Mystifying Magic | 1994-02-08 | 19 min |
| Season 15 | Episode 6 | Monster Mayhem | 1994-02-22 | 19 min |
| Season 15 | Episode 7 | Doctor Miracle | 1994-03-01 | 19 min |
| Season 15 | Episode 8 | Betrayed | 1994-03-08 | 19 min |
| Season 15 | Episode 9 | Hunt the Alien | 1994-03-15 | 19 min |
| Season 15 | Episode 10 | The Final Countdown | 1994-03-22 | 19 min |
| Season 16 | Episode 1 | Sent Away | 1996-01-15 | 19 min |
| Season 16 | Episode 2 | Grainger Danger | 1996-01-22 | 19 min |
| Season 16 | Episode 3 | Spies All Around | 1996-01-29 | 19 min |
| Season 16 | Episode 4 | Trouble for Mary | 1996-02-05 | 19 min |
| Season 16 | Episode 5 | The Poster Comes to Life | 1996-02-12 | 19 min |
| Season 16 | Episode 6 | Bombs in the Country | 1996-02-19 | 19 min |
| Season 16 | Episode 7 | Surprise | 1996-02-26 | 19 min |
| Season 16 | Episode 8 | The Pilot | 1996-03-04 | 19 min |
| Season 16 | Episode 9 | The Secret Quarry | 1996-03-11 | 19 min |
| Season 16 | Episode 10 | Captured | 1996-03-18 | 19 min |
| Season 17 | Episode 1 | Escape from the Black of Beyond | 1997-04-14 | 19 min |
| Season 17 | Episode 2 | Guzzle Trouble | 1997-04-21 | 19 min |
| Season 17 | Episode 3 | Banana Drama! | 1997-04-28 | 19 min |
| Season 17 | Episode 4 | A Giant Celebration | 1997-05-05 | 19 min |
| Season 17 | Episode 5 | It's All Come Out in the Wash | 1997-05-12 | 19 min |
| Season 17 | Episode 6 | Take the Bull by the Horns | 1997-05-19 | 19 min |
| Season 17 | Episode 7 | Operation Recovery | 1997-05-26 | 19 min |
| Season 17 | Episode 8 | Black to the Future | 1997-06-02 | 19 min |
| Season 18 | Episode 1 | The Box | 1998-01-12 | 19 min |
| Season 18 | Episode 2 | The First Key | 1998-01-19 | 19 min |
| Season 18 | Episode 3 | The Watchers | 1998-01-26 | 19 min |
| Season 18 | Episode 4 | Kidnap | 1998-02-02 | 19 min |
| Season 18 | Episode 5 | The Crystal Connection | 1998-02-09 | 19 min |
| Season 18 | Episode 6 | The Trap | 1998-02-16 | 19 min |
| Season 18 | Episode 7 | The Box is Opened | 1998-02-23 | 19 min |
| Season 18 | Episode 8 | Into the Box | 1998-03-02 | 19 min |
| Season 18 | Episode 9 | Betrayed | 1998-03-09 | 19 min |
| Season 18 | Episode 10 | The Final Hour | 1998-03-16 | 19 min |
| Season 19 | Episode 1 | Into the Crystal Caverns | 2001-01-16 | 19 min |
| Season 19 | Episode 2 | The Castle of Gloom | 2001-01-23 | 19 min |
| Season 19 | Episode 3 | The Glen of the Green Man | 2001-01-30 | 19 min |
| Season 19 | Episode 4 | No Hope Valley | 2001-02-06 | 19 min |
| Season 19 | Episode 5 | The Word Master | 2001-02-13 | 19 min |
| Season 19 | Episode 6 | Zzaap Looks Back | 2001-02-20 | 19 min |
| Season 20 | Episode 1 | A Light at the Window | 2004-03-01 | 19 min |
| Season 20 | Episode 2 | The Girl in Blue | 2004-03-08 | 19 min |
| Season 20 | Episode 3 | A Flicker at the Fairground | 2004-03-15 | 19 min |
| Season 20 | Episode 4 | Phantoms and Photographs | 2004-03-22 | 19 min |
| Season 20 | Episode 5 | A Secret Comes to Light | 2004-03-29 | 19 min |
| Season 21 | Episode 1 | Welcome to LRTV | 1995-04-24 | 19 min |
| Season 21 | Episode 2 | LRTV Gets Moving | 1995-05-01 | 19 min |
| Season 21 | Episode 3 | Kitchen Capers | 1995-05-08 | 19 min |
| Season 21 | Episode 4 | A Soap Square Sizzler | 1995-05-15 | 19 min |
| Season 21 | Episode 5 | ...and Action! | 1995-05-22 | 19 min |
| Season 21 | Episode 6 | Follow That Frog | 1995-06-05 | 19 min |
| Season 21 | Episode 7 | LRTV Gets It Together | 1995-06-12 | 19 min |
| Season 21 | Episode 8 | Happy Birthday LRTV! | 1995-06-19 | 19 min |
| Season 22 | Episode 1 | Programme One | 2002-09-10 | 19 min |
| Season 22 | Episode 2 | Programme Two | 2002-09-17 | 19 min |
| Season 22 | Episode 3 | Programme Three | 2002-09-24 | 19 min |
| Season 22 | Episode 4 | Programme Four | 2002-10-01 | 19 min |
| Season 22 | Episode 5 | Programme Five | 2003-01-17 | 19 min |
| Season 22 | Episode 6 | Programme Six | 2003-01-24 | 19 min |
| Season 22 | Episode 7 | Programme Seven | 2003-01-31 | 19 min |
| Season 22 | Episode 8 | Programme Eight | 2003-02-07 | 19 min |
| Sound | Debbie Wiseman | Theme Song Performance |
| Directing | Colin Cant | Director |
| Production | Cas Lester | Producer |
| Production | Anne Brogan | Executive Producer |
| Writing | Jim Eldridge | Writer |