Quote by the fat controller
Only thing I would be concerned about is the congestion charge in and around London. I think it applies to vehicles operating within the M25, so look into that.
That is the LEZ (Low Emissions Zone)
https://tfl.gov.uk/maps/low-emission-zone
The congestion charge zone is much further in.
https://tfl.gov.uk/modes/driving/congestion-charge
I'm not sure what the situation is with the LEZ if the vehicle is foreign registered, as the control is by way of ANPR and that links to the DVLA database.
If the vehicle isn't on the DVLA database how can they tell if it complies or not?