[David_Hayward (RIP)]

It would appear that the Tax Discs on Middx-registered vehicles expired at the end of 1939...I assume that they all did or did they renew part-year? Photo evidence suggests that they did not renew but had, initially, authorities under the DRR stating that the vehicle was operated on behalf of the Crown. I would imagine that after registration was abandoned the use of the authority was dropped. That said it appears that Government vehicles used for official purposes in connection with the services still had registrations and would presumably have an authority on board, plus the tax disc with either 'NIL' or as post-war, a disc certifiying that it was being used for official purposes, with the Department named, e.g. Air Ministry.