If you’ve accidentally left your bowler hat on the bus, there are a couple of places in Mayfair that will welcome you as your scruffy self. Delfino’s Pizzeria is one of these places. It’s casual, inexpensive, and the food is all very solid. A really top pizza or pasta here won’t cost you much more than a tenner. Just don’t go expecting Mayfair-style decor or service, everything here is far too rough-and-ready for that.