That is interesting thank you. However, there was no way I could position a ring spanner of the type suggested on one of the nuts (the lower one if I remember correctly). The other was accessed by a series of socket extension bars from the off side wheel arch.
My recollection was that beneath the water rail pipework access was limited to somewhere between 2 and 3 inches only.

That sound a very worthwhile trip. That reasonable price does just say to us yet again that going to a recommended specialist who knows these cars inside out usually works out cheaper than taking a gamble with a generalist as well as it guaranteeing a proper outcome.

Well, the second expert came and went.
The conclusion I have come to is they simply don't have the necessary software and won't buy it to fix just one TF.
So, I have combined an MG getaway with the Missus and a visit to the MGOC workshop,
They have the gear and it gets us a good run out in an area I have never been to before.
The actual cost inc vat is £40.00 plus the price of a fob which I already have, so I thought pretty good value.
I shall update.