If your current car is costing that much to run sell it & get 1.1 fezzy or something to pootle about in.
What is the big rush in buying an EK9?
I would take a look at DCY, competitive prices for sure & not too far for you to travel.
Just remember, you get what you pay for, obviously your not looking for a stock minter otherwise you wouldnt of had a second glance at the one in Gatwick but then on the otherhand you was worried about if it had been driven hard, i think all the mods answer that question.
If i was you i would take my time in to finding a standard unabused one, that would give you some idea to the life it has lived. Definetley dont make your mind up over the phone before viewing A) beacuse photos dont pick up any glitches & B) it gives you no room to haggle the price down.
You can still modify the car to how you want knowing that its been looked after & then sell the stock parts to get some cash back.
I know its exciting getting a new car & you just cant wait but in the long run it can save you alot of hassle & ££££££.
Good luck in finding one dude