There are some excellent pies to be had Porters in London's Covent Garden - a restaurant which also proves there is such a thing as English cuisine.

http://www.porters.uk.com/menu/default.asp?menuID=13

However,nothing quite beats the delights of consuming a piping hot pie of unknown origin whilst watching your Third Division football team being hammered by the league leaders on a freezing Saturday in January.
Happy days.