As a not englishman: Isnt a Pub quite stuffy for hot weather?
Aww poor you German. You don't know about the British beer garden culture. When it is hot in the UK (rare) all the British descend into the pubs. Most pubs have gardens with many seats outside. However, British people will use parks, gardens for BBQ's and socialising. It is one of the greatest times to be British. When a bank holiday falls on a hot day its extra special. Beer, sun and friends.