The originals of most, if not all of these demos are available at 8BS and The BBC Lives.

Airwolf  540k
A-Team  507k
Cavatina  1742k
Cold Tea  602k
Cold Tea-reversed  602k  yup, it's Psycastria!
Dr Who  1240k
Frogger  732k
Ghostbusters  1750k
Help!  1028k
Match of the Day  158k
Mexico 86  232k
Oxygene  1130k
Spitting Image  191k
Stairway to Heaven  749k
Sugar Plum Fairy  251k
Superman  1167k
Tetrachloromethane: The Addicts Theme  1936k
The Model  1543k
Wombles  555k