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?!
I often stop when passing this artery of city traffic. The dwarfing structure casts shapes and shadows which can easily be missed when speeding in/out of the city.
The Party Superstore was/is my absolute favourite London shop until it was bizarrely attacked and gutted during the summer London riots. They have been since adopted as a concession by the local Debenhams but you can still savour the full delights of the products and nonsense on line.
A slice of Scandi in the heart of London. Great for lunch, with all the meatballs, salads and classic Scandi foods you could want, along with a great little deli shop too.