Looking at the new Lexus IS 2013, the IS250.

Lexus UK advertise it OTR base price, no extras £26495

Lexus Manhattan N.Y. MSRP base price, no extras $35,065

Converting it to sterling it's roughly £22357.

So why don't Lexus sell it for the same price here. Because they know we're mugs and the gravy train choo choos along without any opposition.