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.