Sorry guys, I should've asked for a copy of the
TSB and seen if they'd let me have it. Probably they'd have said no but you never know. I did ask if I could have a copy of all service records for the car, which they couldn't because of privacy issues, but the advisor did seem to be trying to be helpful as he said he'd look into whether there's any way around that.
I rang some independent transmission places today, had a couple of amicable chats (and one not so). Anyway the shop recommended by Bundy were able to indicate a price (based on prior invoice) more around what I was expecting and were even recommended by the guy from another of the shops, so reassuring at least that there's a good operator in town. First though is to try my luck through Ford owner support...