Anybody who suffers from any type of food allergy will know just how frustrating it can be when you're invited to a party or event. If you're lucky, your hosts will attempt to make some sort of provision - a plate of crudities perhaps, or a bowl of tinned olives; if not, it's likely that you'll be the one smiling politely whilst declining an array of tasty morsels, all because they're packed full of dairy, gluten, nuts or egg or any other potentially harmful ingredient, which