Historical version 6 of Victoria And Albert Museum (view current version)
Museum in South Kensington, often referred to as the V&A. Entry is free.
It specialises in the decorative arts, covering textiles, ceramics, sculpture, jewellery, musical instruments, ironwork, et al. It is certainly one of London's finest museums, with a well-chosen collection wonderfully displayed by thematic areas. The building itself is on several levels, centered around a outdoor garden area (the John Madejski Garden).
As of late 2007 (and for some time previously), it holds a "contemporary late night event" on the last Friday of every month (except December), themed around, for example, knitting or couture.
Venue Hire: Drinks in the John Madejski Garden followed by a fork buffet in the Dome for four hours for a Saturday evening is £8,000 plus VAT (bit hard to find the info on the website, look under Resources->Corporate Events).
See also: