Sorry Ben J!!!!
Unfortunately i couldnt find a gromet anywhere (the mk2 must be different to the mk1 172) nor could i find a suitable place to drill! the engine bay is rammed! a lad down the street has a 1.2 clio so i had a look where he put his amp lead through, but where he drilled on his car had loads of pipes in the way in my car!
I ended up tapping into the power lead that goes into the back of the stereo (after deciding against tapping into the ignition power lead) - i wasnt sure if it would work but it has hurray, finally some decent bass.