It would seem that in 2019 when the ULEZ is introduced into London that if your log book is marked "historic vehicle " you can still drive into the city center. It is worth a good read of Tfl ste. https://tfl.gov.uk/modes/driving/ultra-low-emission-zone/complying-with-ulez
Carry on like it is in the splittie world, and only rich people will be able to buy buses soon enough anyway