Classics are not exempt from the ULEZ. Unless they comply with the euro standards. I just checked on the TFL site using my reg numbers for my 2012 defender, 1956 motorcycle, 1967 motorcycle, and 1976 motorcycle. None of them comply and all are subject to the ULEZ charges. The OP is concerned with the planned expansion of the ULEZ area rather than the current LEZ and ULEZ zones. If he wants to drive a defender in the ULEZ zone he is going to pay the charge. Residents within the zone get a reduction until 2022 then have to pay in full.