IAS Cargo Airlines operated four DC-8-50 aircraft between 1975 and 1979.
G-BDDE from July 1975 until August 1979
G-BDHA from February 1976 until August 1979
G-BIAS from February 1978 until August 1979
G-BSKY from February 1978 until August 1979
TMAC Trans Meridian Air Cargo operated two DC-8-50 aircraft between 1977 and 1979 plus one DC-8-30 purchased for spares.
G-BETJ a DC-8-30 which was bought in May 1977 and was eventually scrapped in July 1984. This particular aircraft was formerly 5Y-ASI and purchased from ASA African Safari Airlines in 1977 for spares.
G-BFHW from March 1978 until August 1979.
G-BTAC from July 1977 until August 1979.
IAS Cargo Airlines (LGW) and TMAC Trans Meridian Air Cargo (STN) merged on the 15 August 1979 to form British Cargo Airlines. The newly formed airline did not last long as it went under in March 1980.
Although the DC-8 was a rather rare aircraft under the UK registration there must have been several British pilots at the time who were licensed to fly the aircraft.
The history of both IAS and TMAC would be an interesting topic to discuss. TMAC for example was originally owned by the Trafalgar House Group who were also the owners of Cunard Line, Daily Express, Ritz Hotel London and many other well known companies at the time.