22 full episodes, 7 partial episodes or sequences and a clip reel exist.
Thank you Ray for your above post and here they are ...
Existing Full Episodes
The first 11 had Raymond Francis as Lockhart and Eric Lander as Baxter with other cast members being ...
01 Season 1 Episode 17 6/1/60 Victim Of The Dark Peter Vaughan John Abineri
02 Season 2 Episode 05 2/6/60 Two Blind Mice Patrick Troughton Alfred Burke
03 Season 3 Episode 06 10/3/61The Widower Griffiths Jones Georgina Cookson Gwen Nelson
04 Season 3 Episode 07 17/3/61 Whistle And I'll Come John Breslin Jameson Clark
05 Season 3 Episode 23 14/7/61 The White Stick Terence Alexander Jack Smethurst
06 Season 3 Episode 26 4/8/61 Dead Ringer Peter Vaughan Betty McDowall
07 Season 4 Episode 02 15/5/62 Accessories After The Fact Ronald Radd Frank Williams
08 Season 4 Episode 37 22/1/63 Beware Of The Weepers Reg Lye Harry Fowler
09 Season 4 Episode 40 12/2/63 Operation Tiptoe Ian Shand Pamela Conway
10 Season 4 Episode 44 19/3/63 A Bird To Watch The Marbles Pauline Munro Delphi Lawrence
11 Season 5 Episode 08 20/8/63 Expert With Salt Naomi Chance Ronald Leigh-Hunt
The next 11 had Raymond Francis as Lockhart with Johnny Briggs and Michael McStay as the Sergeants
12 Season 7 Episode 12 19/04/65 Music For Murder Alan Gifford Ann Firbank Petra Davies Philip Bond Edina Ronay
13 Season 7 Episode 14 03/05/65 Smokey Glyn Houston Liam Redmond John Woodnutt
14 Season 7 Episode 15 10/05/65 A Place In The Sun Patricia Routledge Reg Lye
15 Season 7 Episode 16 17/05/65 The Best Years Of Your Life Richard O'Sullivan Chris Sandford
16 Season 7 Episode 17 24/05/65 A Fistful Of Trouble Peter Bowles Jess Conrad Garfield Morgan
17 Season 7 Episode 19 07/06/65 Rat In A Trap Jean Kent David Saire
18 Season 7 Episode 20 14/06/65 Chain Of Guilt Deryck Guyler Pete Murray Carmen Munroe
19 Season 7 Episode 23 05/07/65 One Good Man And True? James Maxwell George Tovey
20 Season 7 Episode 24 12/07/65 The Reunion Imogen Hassall Ronald Howard
21 Season 8 Un-transmitted? 1965 A Home Posting Derek Newark Patricia Haines David Sumner
22 Season 9 Episode 02 11/5/66 Ask Me If I Killed Her Derek Godfrey Yootha Joyce
The last one had Raymond Francis as Lockhart and Sean Caffrey as the Sergeant with among cast
22 Season 10 Episode 01 15/3/67 It's All Happening John Carlin Ursula Howells
Existing Partial Episodes
The first 6 had Raymond Francis as Lockhart and Eric Lander as Baxter with among cast being
01 Season 3 Episode 18 09/6/61 Process Of Elimination Patrick Troughton John Stone
02 Season 4 Episode 11 17/7/62 The Bank Job Maurice Kaufmann Richard Caldicot
03 Season 4 Episode 14 07/8/62 The Common Murder Patrick Newell Chris Sanford
04 Season 4 Episode 23 09/10/62 Time To Kill John Humphry Charles Lamb
05 Season 4 Episode 25 30/10 62 Key To Murder Pauline Yates Molly Weir
06 Season 5 Episode 09 27/8/63 Peggy Catherine Woodville Elizabeth Begley
The last one had Raymond Francis as Lockhart with Johnny Briggs and Michael McStay as the Sergeants
07 Season 9 Episode 08 24/6/66 The Smoker Kenny Lynch David Collings