Join author Andrew Martin as he introduces his quirky and brilliantly colourful field guide to London Transport's moquette patterns: SEATS OF LONDON. Tix £5 to include a glass of wine or cordial. Buy online or in shop. London Transport has always wanted the best design, be it Charles Holden's superb art deco Tube stations on the Piccadilly Line, its elegant Johnston typeface or Harry Beck's Tube map, and this pursuit of excellence has extended even to the design of its fabric seat covers. Andrew Martin, acclaimed author of the definitive Tube history Underground, Overground, has written a delightful, surprising and covetable guide to moquette patterns and their history. 7pm.