Not sure if they offer what you are looking for, especially after 9/11, but GECAT (GE Capital Aviation Training)
http://www.gecat.com/ and FSB (Flight Safety Boeing), UK HQ in Luton but couldn't find a link, would be worth a call. They both have 757 sims, as do BA
http://www.britishairways.com/inside...lightsim.shtml and Monarch
http://www.monarchairlines.co.uk/car...ningsafety.asp
As I say, not sure if they rent to individuals but an amail or call is worth the time.
Good luck
PP