I follow The Holborn Rooms on Instagram and they do the most beautiful looking pies which also look like they'd taste amazing. They do Wellington Wednesdays and even though I don't eat beef much, I'd eat one of those quite happily.
I have never, however, found the appeal of a potatoes pie. Potatoes inside pastry? Too much starchyness for me. A local pie to me is Moonraker pie which is a potato and cheese pie.