Car appreciation... the aesthetics, the engineering, etc

Should be fine, but maybe contact to double check if you're concerned.

My understanding is that if it passes whatever EURO[X] they use it should be fine. There are plenty of cars out there from as early as 2002 that are compliant.

edit:

Cars: Any diesel not conforming to Euro 6 emission standards and any petrol not conforming to Euro 4 emission standards.
RAC