Roland Perry wrote in
.uk:

Try http://www.gobycoach.co.uk and see what the bus fare is from
Gatwick or Stansted to London. I think they will be very similar.

In the last few months National Express have started up a cheap coach
service from Stratford to Stansted:

http://www.nationalexpress.com/nxair...ast_london.cfm

£6 one-way, journey time is timetabled for about an hour, although any
serious problems on the M11 will obviously affect that. Stratford's
possibly a bit of a trek for those over in west London but for a lot of
people (like me) this is far more convenient and quicker than travelling
all the way over to Victoria.

Iain