Originally Posted by
cener
I've flown Continental for many years, often this same route, and never encountered a ticket that couldn't be changed at all. Usually it's $250 plus fare difference.
There are a number of fares ex-Europe (like the OP's, starting in LHR) where the fare rules are quite clear that there are no changes permitted. Period.
This is keeping in line with the competition over there and the comparable restrictions faced from those carriers.