Unless the IS220 has been well looked after and it has been used mainly for motorway mileage, and you need a car for long distance driving, it is best avoided.
There is an IS250 for sale on Autotrader for the same kind of money, although it needs an alloy wheel refurb and has a fault with wipers and has 130K on the clock, it might be a better bet.
http://www.autotrader.co.uk/classified/advert/201702182455144