Could you not just get an ABS/SRS specialist to plug in and rectify the fault? The amount of bits about for mini's, I'm sure someone still makes all the airbag components. The repair bill is a drop in the ocean compared to the maintenance costs of keeping a classic motor on the road.
The cost of a repair is negligible compared to the cost of your life.
Isto is absolutely bang on!
A bit of a circle game, this one. Yes, of course Isto is right. The point is, there will be not be the parts to put the system right shortly. After doing some research and speaking to someone I know at a major Mini restoration firm last night, it seems the SRS seat belt components have been out of stock for a long while, Airbags are like hens teeth as are other vital bits. Indeed, one of those bits is the rotary coupling which can also put your horn out of action. Whilst not wishing to be a prophet of doom, now might be a good time to find a way round this conundrum. For example, lobbying VOSA for the real facts on(say) non airbag wheels fitted prior to the legislation (is retrospective legislation legal?) and getting information from parts suppliers on the compatibility of different parts between models. Finally, if someone is aware of firms that are still making these bits - please let us know who they might be.