Yes, did reread that link after posting above. Panic now over

I traced the clicking noise to a position above the glovebox, below the airbag.
I removed the glovebox and lo and behold:-

The heart of the unit. I pulled the 7.5Amp fuse opposite to the one that you see fitted and they went off.
Everything now works and its ready. Just going to arrange temporary insurance cover and its ready to go for its MOT.
STILL NO LOGBOOK by the way

I tried to work out when I posted the application, I reckon it was between Christmas and New Year when I decided I was going to make the purchase. Must be getting very close to the full 6 weeks now