These are my written details, these editions are still on betamax so i can't watch/screengrab at the moment.
Thank you for adding those, Paul. I can confirm the following:
S03E07Curved Air perform "Backstreet Luv" (1.33-1.46)
T Rex perform "Get It On" ex TOTP (1.46-1.57)
The Mixtures perform "The Pushbike Song" ex TOTP (1.57-2.09)
The Pretenders perform "Brass in Pocket" ex TOTP (2.54-3.11)
Status Quo perform "What You're Proposin'" ex TOTP (3.11-3.30)
Peter GABRIEL performs "Games Without Frontiers" (3.30-3.49)
Montage seq American towns compilation (7.37-9.28)
The Tubes perform "TV is King" (11.05-12.08)
David ESSEX performs "Hold Me Close" ex TOTP (12.39-13.10)
Dion performs "The Wanderer" (13.50-14.37)
Little Richard performs "Lucille" (15.23-16.13)
The Buzzcocks perform "Sixteen Again" ex OGWT (17.17-17.58)
Diana ROSS & the Supremes playing table tennis & "You Keep Me Hanging On" (18.31-19.17)
The Lovin' Spoonful perform "Do You Believe in Magic", concert with crowds (26.24 to end, titles over at 28.19)
S03E08Rounds of questions on sound & lyrics clues (0.34-8.09)
James BROWN performs "Out of Sight" (b/w) (-9.06)
SPARKS performs "This Town aint Big Enough for Both of Us" (TOTP) (9.39-10.00)
SQUEEZE performs "Take Me I'm Yours" (TOTP) (15.27-16.05)
ADAM & THE ANTS perform "Ant Invasion" (OGWT) (16.33-17.13)
SMALL FACES performs "Itchycoo Park" (b/w) (17.59-18.39)
DOORS performs "Moonlight Drive" (19.22-20.01)
Elvis COSTELLO performs "Oliver's Army" (TOTP) (20.47-21.31)
TALKING HEADS performs "Don't Worry About the Government" (OGWT) (22.00-23.05)
David BOWIE performs "Oh You Pretty Thing" (OGWT) (26.13- end; credits over at 28.30)
S03E09The Police perform in studio 'Can't Stand Losing You'(6.29-7.05)
The Bee Gees perform in studio 'New York Mining Disaster'(4.49-5.29)
Joni MITCHELL sings in studio 'Carey'(12.31-13.05)
The Ronettes perform in studio 'Be My Baby'(13.49-14.35)
Dionne WARWICK sings in studio 'All The Love In The World'(16.18-16.58)
The Jam performs in studio 'Man In a Corner Shop'(20.41-21.24)
XTC perform in studio 'Statue of Liberty'(21.47-22.29)
The Beatles in promotion for 'Strawberry Fields'(17.48-19.03)
The Byrds perform in concert 'Mr Tamborine Man' (26.25-28.46) Credits over (28.23-28.46)
S03E10Rolling Stones perf. "Gimme Shelter" ex Pop Goes the Sixties tx 31.12.68 (5.09-6.24)
Eddie COCHRAN perf. "Teenage Heaven" (c) Film Finders (7.10- 8.08)
sp s grafix seq to illus 10 songs with "Blue" in titles (8.45-10.37)
Gary GLITTER perf. "Leader of the Game" ex TOTP ex 25.12.73 (15.08-15.52)
Elton JOHN perf. "Your Song" ex TOTP tx 14.1.71 (16.42-17.45)
Ray CHARLES perf. "Let The Good Times Roll" (c) Film Finders (18.21-19.14)
Bruce SPRINGSTEEN perf."Ros- alita" at concert (c) CBS Records (19.40-20.17)
Human League perf. "Open Your Heart" ex Swapshop tx 24.10.81 (21.02-21.38)
Duan Duran perf. "Is There Some- thing I Should Know" ex Kenny Everett Video show tx 17.3.83 (21.59-23.01)
Humble Pie perform "Natural Born Boogie" (c) Studio Hamburg (26.50-29.02)
S03E11sp s ftge to illus 10 songs re school (4.48-6.38)
Jona LEWIE perf "Stop the Cavalry" (c) Stiff Records (8.52-9.07)
Jimi Hendrix perfs "Wild Thing" ex film "Monterey Pop" (11.47-12.40)
Culture Club perf "Church of the Poison Mind" (c) Virgin Records (13.20-14.02)
Gene VINCENT perfs "Dance in the Street" (c) Film Finders (14.51-15.25)
ELO perf "Roll Over Beethoven" ex TOTP tx 1.2.73 (16.25-17.14)
The Who 1965 perf "My Generation" (c) Film Finders (17.50-18.38)
The Jacksons perf "Blame It On The Boogie" (c) CBS Records (19.04-19.38)
Fleetwood Mac perf "Albatross" ex BBC Lib - check (c) (26.22-28.48)
S03E12Studio vt, ex-lib vt, promo vt
The above descriptions, for the second half of series 3, are taken from the BBC Archive database. Unfortunately, the majority of episodes (including all 21 episodes of Series 1 and 2) are indexed in a similar way to their S03E12 description, i.e. no detail whatsoever!
Any "missing" footage is therefore most likely to be in the first two series as even the BBC don't know what's in them!