BT used the ICL One Per Desk extensively when I was on IT support, it combined telephony and computing on one unit. Actually the BT version was called a "Tonto"
I remember once we had to decommission a BT building which had been empty for years prior to sale. One office was locked but we forced the door and on the desk was an OPD still switched on and with a spreadsheet open on the screen, still running after all that time. It was a good machine, the drives were its weak point. The rule was to save everything twice using two separate tapes.