I was a Technician apprentice from 1957 to 1962. I ended up trying to learn how to be a salesman in the CCTV division in Basildon.
This yarn that I am presenting originated in Shop 16 while working on the MK IV b/w cameras which the company was selling like hot cakes in the US. I asked why the drawings we were using for the assembly of the cameras were all marked “Provisional” when the company had been producing them for well over a year. I was told that it was because of a longstanding agreement between MWT and RCA in New York (which was the successor Company to Marconi's Wireless Telegraph Company of America (MWT) in which the two companies would share production drawings once the product had achieved production status.
So Marconi was playing a game with the status of these very popular cameras. Many years later when working with RCA in London in their Computer Division I found out that the English Electric computers (System 4) happened to be 'instruction compatible' with the range of RCA computers. As it happened RCA pulled out of the computer business altogether within a year of that time (around 1972).
I would be very interested to know if there is any truth to these assertions and just how MWT of America became RCA. Presumably RCA took over the US branch of Marconi at some stage, I wonder when.