Can you tell the difference between a tin of 'Stewed Steak with Gravy' and a tin of 'Stewed Steak with Gravy, Pie Filling'? Do you know how much water you buy with every frozen chicken or tin of ham? Could you tell the difference between a lump of vegetable protein and a lump of beefsteak? Exactly one hundred years ago Disraeli introduced the first effective Food and Drugs Act to protect us from adulterated food. Now that Act has grown into a massive tome of rules and regulations and in this programme Christopher Brasher wends -his way through the complexities of modern food trying to find out what we are really eating. Film editor ROGER GUERTIN Producers CHRISTOPHER BRASHER and TONY EDWARDS