Yep it's a UK car, GT spec. Price looks ok for 80k+ on a 54 plate and you might be able to haggle a bit. Petrol will depend on the roads and how you drive, anything from 18mpg to 30mpg. You should be able to average 22/24. Servicing will depend on where you are located, whether you use Nissan or an independant and which service. P3 is the most expensive one (goes P1, P2, P1, P3) and should be 9k or 12 months.