Future Computers/Cortron ITW Magnetic Valve Keyboard -£75 (free postage to UK)
This is a pretty rare keyboard from what I gather. It is in great condition for its age. I cannot test it because it doesn't use a standard protocol but someone out there could possibly convert it. Alphameric 142-2762 - £14 + postage.
It's a foam & foil board which I never bothered trying to convert. Thanks!