Richard.Sandwell(a)roebry.co.uk wrote:
  Can't remember - did Sinclair license the
technology to ICL and *cough* BT?
 Would the Merlin Tonto and ICL OPD (one per desk) have covered off the
 professional market perhaps? 
The ICL One Per Desk!  The name tells you just how many they thought
they'd sell.  I have one, bought at a junk shop in Bath, and here's
a (not very good) photo:
   
http://www.gifford.co.uk/~coredump/opd.htm
Note the phone handset on the left-hand side and the two phone cords.
--
John Honniball
coredump(a)gifford.co.uk