http://cgi.ebay.co.uk/Land-Rover-MG-ROV ... 1e63cb9dbf
is being advertised as a docking station. However I'm pretty sure it's the magic interface bit for a T4 (Testbook version 4.Computer Diagnostic System). At that price it's a bargain, so long as it has some cables. Certainly the side view shows the place to plug in the interface cables to the car.
If anyone wants to make some enquiries of the seller, and needs me to look at mine to check, feel free to ask.
I thought of bidding as it's a mega bargain (so long as it's what it appears to be), but I really couldn't justify even to sell on.