We are driving to Canary Wharf today in an ULEZ compliant car but because it is foreign we have to pay, I think? I've looked at the website and it says you can register your car and in 10 days (!) they will give you an answer. Has anyone done this? Thanks!
(As an aside, I am amazed at how many parking apps/schemes/websites just don't work for foreign cars and foreign mobile phones....grrrrr....is the UK closed to tourists?)