FULL ROUTE VISUAL - Route 12 - Dulwich Library - Oxford Circus - LT438 (LTZ 1438) 

A rather boring and packed route (mainly for tourists), but a decent link between Central and South London. Only decent part was north of the Thames really: most of the route before Elephant and Castle is mainly covered by the N89 (during the night ofc), a much better alternative.
Journey time: 56 mins