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.
It is one of the most important business centres in London. Crowded of suits at daytime, perfectly deserted at night. It is so striking relaxing to walk in there enjoying the silence and the lights! It makes you feel pleasantly far from reality.