During the next few months, I'll have to travel down to various London boroughs (inner and outer) once or twice a week. The journies will be at short notice, and liable to cancellation, so advance tickets aren't really an option. I'd like to have as long as possible in London. Doncaster is my nearest main-line station. The best I can come up with is Doncaster -> Peterborough £45.10 (Off-peak but seems OK anytime) Peterborough -> Finsbury Park £33.10 (Anytime FCC) London travel card zones 1-6 £15.00 This gives me a whole day in London for £93.20 as opposed to the Doncaster - London anytime return of £179.00 (plus travelcard) Can anyone come up with anything better?