Virgin's A340 cabins are more or less the same as the 747-200/400
fleet in terms of amenities. There is a stand up bar and massage
couch in the A340 Upper Class cabin. The Economy Class seats are
the same, but with a 2-4-2 configuration.
I would never, ever choose Northwest over Virgin to London. Virgin
is worth going out of your way to fly with. There has been a lot of
Northwest bashing on this forum lately, and while I agree with
some of the comments, NWAC is trying to very hard to reverse the
negative publicity it has received in the last couple of years. It still
has a long way to go though....
NW has no PTV's and I doubt their in-flight catering and service is
anything like Virgin's. Besides, if you fly NW to London, you'll be
flying on vintage DC10-40.