They describe themseleves as a 'village shop in the City' and sell everything 'typically english' you could dream of, from homemade scotch eggs to english meade, this tiny shop is the reason I cross the road early every morning, just to see what treats they've got in for the day.
On a hot day there is nothing better to do in London then go for a swim in the Heath ponds. You get completely transported you out of the city as Hampstead feels like being in the countryside except you're in central London?!
If you want a peaceful day out of the busy city, Highgate doesn't really feel like London. The cemetery is interesting and peaceful, there's a tour of the old half which is definitely worth the money. Karl Marx, among others are buried there.