This question does appear here all the time - and thats one of the reasons why we are here!!!
Its getting more and more tricky to know what the "actual" named aircraft will be - and for security reasons its better that no-one in the public domain knows - why? - Just imagine Prince Charles was gonna fly to BGI and he was going on VS - the dates of his activities are published so its not hard to know when he's going. A mad man wants to do something bad so they need to know what plane he is going on - by use having a list of the actual plane then we give the mad man a big helping hand.
Suffice to say its more than likely to be a 747 in LGW spec!!! Migth be a LHR spec - but thats unlikely.
Anyway 2 things Tom:
Why not sign up as a v-flyer member - its only a tenner and it really helps us all to run the site and do an even better job - server space costs as does bandwidth!!!! You have 35 posts so you are a regular user!!!
Secondly - make sure you do a TR
Have fun