Don't know if anyone's posted anything about this website before but I found it a while ago.
http://www.dmflightsim.co.uk/default.htm specialise in classic British airliners such as the VC10 and DH Comet. All the aircraft available for download are very good quality and are available in loads of different versions. I think theyre only for FS2004 but i'm not sure, they may work in FSX.