Thanks so much guys. Really appreciate your feedback.
As an update, I've rang Lexus Bristol to ask for some details. They've said they have seen the car there regularly and last time they've gave the owner a quote of £2500 for:
Shock absorbers
Tires
Front lower arm bushes - £1653
They haven't seen the car since. I'm guessing the owner probably was not looking forward to having it fixed so he sold it.
He mentioned you could leave the exhaust as an advisory if it's not corroded much, but if it is you'd have to change the whole system which will cost around £1000.
The Lexus guys recommended to take the car for a health check, but surely the dealer not going to be happy with that unless I actually buy it first.
Not sure what to do. Really looking forward to buying one of these ...