One issue that had haunted the North African campaign was that of spare parts for motor vehicles. There were a great many different vehicles all requiring their own spares with parts wearing at different rates, some demanding frequent replacement some less so. Somehow the right number of the right parts had always to be in the right place at the right time.
Warren and McCausland were key men at Chilwell which was the British Army's centre for mechanisation. Sending them out to Africa on a mission, which was part advisory and part investigatory, underlined just how crucial this issue was.
It wasn't though about Africa, or indeed Sicily or Italy; it was about the invasion of mainland Europe which was then being planned. It was essential that all the lessons stemming from mistakes revealed in earlier campaigns should be taken on board.
There could be only one D Day.