agree with the above comments.
you aren't going to find many flights with better value than £3 per TP ex UK.
depending on timescales and whether you might e.g. have a trip to the US coming up anyway, there are much better value trips in the US at £1 per TP (or below) though those tend to be about accumulating a lot of them - a single US F hop is 60 TPs.
more on that here
http://www.flyertalk.com/forum/briti...er-thread.html though it doesnt sound like that fits your bill of "tightness, 45 only and ex UK"