Just found this site recently http://www.garagewhifbitz.co.uk as I was looking for a daikei steering wheel hub which from searching this was the only place that had them in the UK. This with the works bell hub is known to be the only plug and play hub for an mx5 out there i.e including the airbag defeat circuit.
Now I know you can use the resistor trick, which I used but some people prefer a plug and play solution. The site also has some other interesting parts for the 5 which are also hard to get in the UK so worth a look.
As it turned out I didn’t need the hub I ordered but they cancelled the order quickly and with no fuss. I’m sure I’ll end up spending money with them in future.