Thank you to Keith and James for messaging me.
I have to apologise to both of you for not replying but have only just noticed they were there.
To update progress, I managed to get a legible copy of the one I had. It was however of very little use due to the modifications that have been made over the years to my car. I did buy a new loom a couple of years ago expecting a straight forward install. However when recently getting round to fitting it, it proved it to be of no real use at all. I basically have totally stripped it to use up the cable it contained.
I have been keeping Stephen Hall (registrar) informed of progress and will let him have the final drawing and information on what I have done when completed.
Colin