Found this which looks like it should be relatively simple...
http://www.lexusownersclub.co.uk/forum/index.php?showtopic=79510
Will post some pics when it stops snowing! The pics on ebay don't really do it justice, though this is the car:
http://www.ebay.co.uk/itm/lexus-is200s-/261168792772?_trksid=p2047675.l2557&ssPageName=STRK%3AMEWNX%3AIT&nma=true&si=IunhTiMpMSLeBt%252Bdh3pXmrNG8ik%253D&orig_cvip=true&rt=nc
As usual the wheels are knackered but I'll be replacing them at some point soon anyway, got my eye on some black 18s when I sell the Audi. Just the dilemma of whether to go 8 inch wide or go all out, roll the arches and get staggered 9.5s on the back :)