Good news, thanks very much to a fellow forum user, Ive purchased a couple of bulbs off ebay for £25 and fitted them myself.
Just shows you what an absolute rip off these garages are.
I could change them every year for 10 years and still have a fiver change!
Dont be put off by the covers over the engine, in essence, all youve got to do is remove the engine covers and airbox (and ram air), take out the bolt for the washer bottle. I reckon once youve done it and got over the learning curve you can replace both bulbs in 20 minutes.
So, working on the quote of £255.05 from the Toyota garage (darent approach a Lexus dealer) and using simple maths, say £55.05 labour (that still equates to £165.15/hr, assuming you can do it in 20 minutes) that leaves £100.00 for each of the bulbs!!
This is where I got the bulbs from:
http://www.ebay.co.uk/itm/370513748379?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
And this is the video to watch:
The video is in two parts and shows you how to convert the headlights from normal tungsten halogen to HID but itll show you how to get to the bulbs to change them.