Hopefully that will be a very nice car.
Can't advise on the petrol, but as far as the Sport goes......all the usual. Check the electric gadgets all work, check for steering wobble, clunks from the suspension/drive train, check that the gearbox isn't slipping and works properly in normal mode, sport mode and hi/lo. Check the air con, check the lower tailgate release button works properly, and then just all the normal car stuff. Tyres, brakes, alloy rims for kerbing etc etc.
I would suggest a search on the net to see what others say. On rrsport.co.uk for instance. I have heard that the injectors need regular cleaning and can block for instance.