Sorry Billy but you aren't going to get very far with virtualaviation.com because they've been stopped from doing sim sessions by GE and BA, the owners of the sims they were using.
If you need some big jet time, I'd try European Aviation (www.euroav.com) who have BAC 1-11, 727 and L1011 sims for a reasonable rate.
Be warned though that you gotta send them a copy of your passport before the session, which they send off to Special Branch for some background checks.
Or you could try the rather old but still quite fun Trident sim which is up near Biggin Hill and privately owned by a chap called Andy Mattocks. His number'll be somewhere in the archives.