Didn't Tom Baker appear in a kids tv show in the 1980's called 'Chocolate' ?
I can remember a one off programme he did where there were a few groups of kids had to work and negotiate with each other in a senerio where they they had to find solutions to producing chocolate....or something to that effect.
I have had a look through the list of Toms work and it was not there.
"tom was also in a 70s kids tv show arthur of the britions on itv i think you can get it on dvd wich i will do . there was also a clip of tom on docs about london in the coach and horses pub in the 70s ive been there a few times theres a bust of tony hancock in there back in the 90s