Last night I found a post on the Retro Computer sales forum on facebook for an item that I used to own back in 1984.
A DKTronics keyboard upgrade for the ZX Spectrum.
These are currently hard to come by, so I jumped at the chance to make an offer, and we came to a sensible agreement.
It should be winding its merry way to me as we speak.
Keep watching for pics and a report of the working state of it (It was sold as untested!)