UPDATE
Just thought I would give you all an update. I spent the morning at the LEXUS dealership in Bradford. They gave me a IS250 SE Auto for an hour so I could take it for a proper drive. The difference from the 220 was instantly noticeable, it was like driving a different car! After many many hours of negotiation I have placed and order for a IS250 SE Auto with Multimedia. Should arrive on the 16th Nov so not too long to wait. Went for a brand new one in Cadoxton Slate with Pembroke Black interior. Did look at getting it without the multimedia but after playing with it for a bit I decided to blow the budget and spend the extra £55 a month to get it, may live to regret it but at least I'll have plenty of toys to distract me... :D
Thanks again for your help, I'll post some pictures when it arrives.