Re: One Per Desk?
That was the Merlin Tonto, a rebadged ICL OPD (One Per Desk). Basically a Sinclare QL (big brother of your favorite Speccy), without the 8049 peripheral controller but with a POTS communications system grafted onto it. They were built by ICL, and sold by BT. In Oz it was known as the Telecom Australia Computerphone.
The name Merlin seems to have come from the same place as BT's Merlin M4000 line (rebadged Logica VTS-2300 Kennet), although they are in no way related hardware wise. No relation at all to the contemporary AT&T Merlin systems.
Tonto was short for "The Outstanding New Telecoms Opportunity".
All the above was early/mid 1980s.
Note that this has nothing to with the mid-1970s TONTO, The Original New Timbral Orchestra, which is an entirely different subject, and some would say much more interesting.