Whakakī i te rerenga e whai ake nei: Ko tētahi o ngā waka o waho o te BBC, ko MCR 1 (he poto mō te Mobile Control Room), i hangaia e te kamupene Marconi-EMI, ā, i tukuna ki te BBC i te wa tika ki te pouaka whakaata i te whakaaturanga.
Ko te Whakakorenga o George VI me Elizabeth i Mei 1937. He ōrite te MCR 2 ki te MCR 1 ā, i tukuna i te raumati o te tau 1938. Ka taea e ngā MCR te whakahaere i ngā kāmera e toru. I te timatanga, he paerewa Emitrons ratou, engari i muri mai ka whakakiihia e Super Emitrons, he pai ake te mahi i nga paerewa i te marama iti. I hangaia nga MCR ki runga i te papa o te pahi AEC Regal kotahi-papa.