Mizter T wrote:
Though with National Express a Cambridge - Heathrow return costs ?33,
whilst an open return costs ?35 (you need to ring them beforehand to
confirm your return journey so they allocate a seat for you).

It's probably not an option for Colin, but in general it can be considerably
cheaper to do Cambridge-Victoria and Victoria-Heathrow instead of the direct
bus, especially if there are 1 pound Funfares available on the Cambridge
leg. If the connections work out it's not a lot slower either. ISTR doing
it for a total of a fiver each way in the summer.

Theo