Well, thanks to Micke's help, BRB is back on its wheels, but since the katsastus (MOT) has now expired, I need to get it back on the road again early next year. We need to reinstall the stock seat and delete the airbag warning light to get through.
Eventually, in the continued absence of any hardware from K Sport for the BBK, I ordered a full R56S brake kit from Mod A Mini, with calipers, carriers, Pagid discs and pads, and HEL lines; which arrived promptly, but without the special order red HEL brake lines. Or carrier bolts. So we found a local(ish) place, only an hour away, and had some new lines made up. And found some correct strength bolts at IKH (the sort of serious hardware store, much more local). And we fitted it all last night ... with Micke as my spannerman. He's pretty good, only needs coffee and conversation.
At least my son is now a happy bunny as he can re-start his learning to drive in the 53 - the only manual in the fleet.
I'm still incredibly irritated by the slow response from K Sport...