Thanks for the further help.
Competent ?
I do all the mechanical work on my other Lotus (an Elan Sprint) including a full engine rebuild), however I always refer to the official Lotus Workshop manual.
If I had the correct manual for the LER, then I probably would tackle it myself. However, I've been unable to find a pdf for this online.
As regards the cost of parts, obviously via Vauxhall is much cheaper than the same part from Lotus. Iis there anyone out there who will offer a discount to Joe Public, or is there a recommended seller on ebay, for example ?
I'll give Griffin Autos a ring and see what services they can offer.
Does anyone rate Redline products for gearbox/diff ?
Cheers.