While steak is a favourite for many people, choosing the perfect piece can be a daunting task. Supermarket shelves are filled with different sizes and types of meat, and butchers have display cabinets packed with options. So, where do you start? We've spoken to experts to give you this complete guide to buying steak like a pro. What to look for - and what to ask butchers "Good butchers are worth talking to," says John Molloy, head chef at Gost steak restaurant in Glasgow. "A good butcher will