My clutch went in my is 200, recently. I got a clutch form Japarts for £150, local mechanic charger £120 to fit it.
(it may have been £140 though! But I think he charger £120 labour!).
Sorry I live in South Wales so cant advise anybody in Glasgow. The mechanic who did mine , is no Lexus specialist. So I imagine for most mechanics its relatively straightforward!
thanks for the info mate i called lexus they quoted me £1000 lol i will call round garages this week many thanks