tube travel is piss, just look for the nearest tube stop near your destination, then check which colour line stops at that stop and hop on any train that is going in that direction, don't overthink it.
hop on spareroom.co.uk for a 'quick' look at how much you'll be paying in that area (search by random post code) - but i would recommend gumtree to find a place, more choice, free to use (well, more free) and some way better deals there!
totally guessing here but i'd say 500-600 per calender month plus bills of 50 to 100.
26k is about 1700 a month
20 is about 1300 a month
so entirely depends how you live..
edit: house shares of course!!
Edited by pLo on 07/07/12 9:07am