The start date for Crusader was moved to 18 November 1941

I am sure that it greatly grated on Churchill for his offensive against Rommel to be pushed out as late as 18 November 1941, but there were reasons for the delay. The first was that the 22nd Armoured Brigade arrived late, and then they discovered that their tanks needed time in the workshops to be ready. The offensive had already been delayed due to the delays in accumulating supplies, forward. Finally, the 1st South African had insufficient transport, and the lack thereof interfered with their training an readiness. That was the final delay that pushed the date to 18 November. This is based on the account in Vol.III of the Official History.