Try this link Nick, post number 5 from October last year.
https://www.two-sixties.co.uk/mgoc26...286#post172286
New fan fitted but fan runs at high speed all of the time. I spoke to Jules who could only suggest that the gateway ECU was at fault which still seems to me to be a bit drastic, no other suggestions. PeterV8 had the same problem but he changed the wiring of the relays and managed to solve the problem, a 'fix' which Jules is now providing with his instructions. The instructions themselves are a bit generic (some do, some don't) and although contain details of the 260 fitting, are not very specific. I am still waiting to sort the problem with an electrician, hopefully some time this month.
Jules offers a great service in supplying hard to source parts at a reasonable price but I haven't experienced a very good after sales service.
Nich.