The Marks & Spencer chunky steak in beer less than 5% and the chunky steak in rich gravy in a can are free and really really delicious! Sometimes they have pretty good offers on too.
Morrisons stewed steak in gravy 425g can is also free
And although Princes stew steak isn't free anymore, the beef slices in a can with gravy are!
Remember when Heinz macaroni cheese in a can used to be free? *sigh* I miss it!