Getting a car resprayed is so wide ranging! You can get a cover up job for a couple of hundred quid But is it worth it?
You can get a really good job and at £850 that is what I would expect.
Regarding leaving it for 2 years to be honest it would drive me around the bend to look at it everyday!
Also it gets harder to match the paint the older it gets. i.e. When you come to sell it 2 years down the line there will probably be a noticeable difference so people will ask why? You will tell them the car was keyed! They will probably think that you are hiding something worse like a non disclosed accident.
Personally I would get the work done sooner rather than later.
But that is only my opinion and you did ask.
Terry