Thanks Noby76, for the links the prices are better than my local dealer. The air filter and oil filter from my local parts shop were half the price of Lexus, but I'm going to buy the original parts from Lexusbrim. I have to be honest, I've not been using quality fuel and been persuaded by pump prices. However, once the car has been serviced I'm then going to have the Terraclean Service on the car, in their words this would "decarbonise the engine, restore mpg, reduce emissions and regain performance". I saw this on Wheeler Dealers and have not read any bad comments about this.
Chris thanks for the advice re the fuel filter. I would have bought this and tried to get this replaced.
I love the IS200, I've had a couple but never needed to worry about them as they've all been fully Lexus serviced by previous owners. This one I bought off my uncle has been a bit of pain. What I thought was a bargain, has not turned out to be not as much of a bargin. However I'm hoping once everything is done, there will be new life in the car and I can keep for the long term.