Okay, it's all been resolved. You guys are gonna laugh at this and tell me I did the right thing.
I won't go into too much detail about what went wrong but I was having to take the GTV into the dealers once every 7-8 weeks for something. The last two things were major faults (one under warranty one not)
Anyway, on tuesday I took the day off work and took my GTV back saying "I can't live with this un-reliability, I need something that doesn't keep going wrong."
I had a look around the forecourt and saw a SEAT LEON CUPRA 20VT and a SEAT IBIZA CUPRA 20VT. Both pretty new and the right price. I test drove both and boy did they fly, the LEON threw me back in the seat. After a lot (and I mean a lot) of umming and ahhing and some pressure from the wife to "hurry up, I'm tired of this," I settled on the IBIZA.
As we left (after doing all the paperwork) I looked back at my GTV stood on the forecourt and thought "I'll never drive that again." I didn't sleep a wink that night. I told the people at work and they said stuff like "that's a boy racers car," and "you've swapped a mansion for masionette."
At 5pm I rang the dealer back and said "cancel that SEAT ****, I want my GTV back."
I pick it up tomorrow.