4 TP's needed: cheapest way?

Evening all. probably been asked a million times, but as the timing of these questions normally results in different flights being suggested....

I'm after 4 TP's, originating in the UK before the end of jan.

Have had a look at BMI business, but it looks like I may be better off flying with VS.

I've loads of leave, so no issues with time off. Any suggestions? Want to keep it as cheap as poss! Credit crunch, new car, constantly hungry cats, etc....

[preiffer]

Boston or NYC, once the xmas flight slaughter sale happens. [y]

and, of course, http://www.v-flyer.com/forum/topic.asp?TOPIC_ID=27234

didn't know y fares in bmi got TP's.... happy bunny now

[mitchja]

1 return VS trans-Atlantic N fare will be cheaper than 2 return BMI full Y fares.

Dont forget N fares on VS now earn 2 TP's per leg on all routes.

Regards