Thanks Keith, it's a 2003. Whoever assumed it was for the Auxiliary belt was correct. It was hella awkward to do the repair of the tensioner and pulley. Access is really tricky, with a 13mm deep socket through a hole on the oil filter side. Due to the positioning of the dip stick it was not possible to align the socket whilst attached to the ratchet, I had to carefully using the smallest amount of duct tape fix the 60mm M8 bolt
So it would remain in alignment with the socket and towards the front of the socket. After lots of careful, gentle stabbing blindly I managed to get the bolt through the hole at the back of the tensioner pulley mount, at which point I was able to attach a ratchet with a short extension bar. I was worried that the duct tape method may come back to bite me in the but and I thought with the turning motion the tape may have gotten tightened onto the bolt and socket but to be fair after a few failed attempts at releasing the assemblage it did eventually wiggle free. BTW I did not remove any other parts although I would have considered draining the cooling system to get some of the pipes out of the way to improve access from above the engine bay,but instead I persevered with accessing from below lying on the ground(in the wet muddy woodland track where it died)
Now to hopefully repair my intermittent starting issue(probably a dodgy battery but need to get it drop tested before deciding). For now I am just getting by using a jump starter pack from Halfords in the mornings.
Thanks everyone
Sorry for the late responses
I wasn't getting my email alerts for some reason
Colm