This might be of interest to you folk travelling to London in the next 3 weeks - Half price off peak fares with London Midland - £9:
http://www.londonmidland.com/tickets-and-fares/half-price-tickets-between-birmingham-and-london/?=
@CasaSteve started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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This might be of interest to you folk travelling to London in the next 3 weeks - Half price off peak fares with London Midland - £9:
http://www.londonmidland.com/tickets-and-fares/half-price-tickets-between-birmingham-and-london/?=