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Jubilee Line between Waterloo and Baker Street is considerably posher than my route between Seven Sisters and Highbury & Islington. Suits on my line are cheap and worn with brightly coloured shirts and fat-knotted ties - the sort popular with mobile phone salesmen on Oxford Street. Jubilee line suits are political - pinstripe double breasted - smart and old school. Also there are lots of tourists - anaraks and backpacks.

Change onto the Hammersmith and City line. I'm not chilled out enough for it. I'm a Victoria line girl - a train every minute, one in three an empty train so you get a power-sit down for two stops with time to read the Metro. Hammersmith & City trundles along the oldest cut-and-cover part of the tube network. People get on. People get off. Chucks us all off at Edgware Road after changing drivers, waiting for 10 minutes and then deciding it is now going to be a Circle line train. Nobody complains. In my head I'm hopping mad and cursing. Frustraing. I'm glad I don't have to travel this line always.