If anybody is interested I thought I'd just give a quick update on this.
I picked the car up yesterday and it cost me a grand total of £950 for the gearbox rebuild and fitting etc.
If anybody is thinking of getting rid of their EP and getting something like an Evo then please take things like this into account before you make your decision.
I was prepared for much higher running costs but things like this can't really be forseen and a few weeks after getting the car I had to replace the clutch at £1280 so I'm not even a year ito ownership and already I've had to spend over £2000 on essential repairs.
Now I have to replace or rebuild my EXE-TC coilovers and one of them has gone, that's going to be another grand now.
I'm just waiting for the AYC to go or for me to push a rod through the block or something now.