This episode is also known as "Health Farm".
The Goodies go out to dinner and are disgusted with the fact that none of the food is fresh. So they decide to visit Tim's Uncle Tom to have good fresh country food.
However, Uncle Tom has never seen his livestock — he runs an electronic system which automatically feeds all of the animals. When the Goodies protest at this, Uncle Tom gets them to work for him.
Finally, Uncle Tom is able to see his animals and he realises that they are living beings — and the Goodies then strike up with even more problems as a result.