Thanks.
It's in a slightly trickier place to get to than the petrol but I'm gonna have a go as I changed the fuel filter and it had made no difference.
I did notice that it cuts out when the temperature gauge hits a certain temperature after 30-40 mins driving.
I have had a similar problem with my car going into limp mode. It will work fine for about 20 mins and the the accelerator will stop working. Turn it off for a while and it will work again however it seems to be getting worse. I took it to an auto electricians and they tested the tps and the...