I said to my friend last night, you cannot go wrong with a pint of Landlord, he wasn't convinced, being more of a stout drinker (which I also like) but I've never had a bad pint of Landlord and would almost always have it if it's on. That or London Pride, they're my 2 constant safe bets. It's as well I can't see it from my window!
My 3 'local' breweries are Windsor & Eton, Rebellion in Marlow or Fuller's. If I am London side most of the pubs in West London are (or sell) Fuller's and its only travelled 2 miles. WE can be had in my local but I prefer to go to the brewery tap room when they have open days. Rebellion do some great ales and have ace open days for 'friends' (kind of a paid for loyalty club that involves BBQ and 'free' beer.) Roasted Nuts is a rich and warning one for late summer to spring.