Right so did the compression test which turned out ok! 125-125-125-125 across all cylinders. So whats the next thing i could try?

Another problem that my car has is occasionly cuts out at low revs at traffic lights, when parking etc. i turn the keys off an on an it will run fine again. this problem seems to get worse when the cars warmer.
Do you think it could potentially be thefuel pump and or regulator? my brothers got a v8 discovery which had same symptoms, crap idle, cuts out, lack of power and it turned out to be the fuel regulator. other than this im a bit lost for reasons! thanks though chap.