London's wealth of museums and galleries - and the fact they're mostly free - is a major attraction, upholding the city's worldwide reputation for culture and the arts. Venues like the National Gallery and the Victoria & Albert Museum join in this UK-wide annual event for a month full of activities and events. This year the theme is 'Ideas and Innovation', how this will be executed is still in the planning stages. But to give you a taster, last year we saw artist Grayson Perry and journalist Meredith Etherington Smith debating whether culture or class are more important at the National Portrait Gallery. There were late night events including A Night at the Museum Torch Light To