Hi mate,
Tunbridge Wells is also my local lexus centre and have been going there for a number of years previously with my Avensis.
Andrew from Lexus and John from Toyota are very helpful.
Speaking to the service chap, the labour rate for Lexus is around £94 compared to Toyota's £74.50. He actually told me it's the same "labour" but you pay a premium price for a luxury motor..
What is the spec of your car??
Going to your questions:
1). Not sure - I've never had any problems. If your having interference with this set, I'm not sure a new set will react any differently?
2). The manuals are known for this - as you are well aware.. Some owners find after a short period of time you get used to it, or if you do a search, there was something about holding the clutch in for slightly longer when shifting between 1st and 2nd - to minimise the clunk. Or you may want to invest in a short-shifter
3). Keep a look out on eBay, or Colin may have one on sale soon. If yours is a 2001, you'll notice the T/Wells Lexus Centre isn't actually on there!
4). they are a very good dealership . Mention my name, I'm sure they remember me
Welcome to LOC, it only gets better from here,
Purvesh