I am totally confused now lol
The LEZ that they brought out only applied to Diesel Vans and Lorries Not Cars It had nothing to do with being Tax exempt it was for Old Vans and trucks diesel 3.5 ton and above, you had to have at least a Euro 4 engine to come into the zone in a Van without charge, some older trucks had to have a very expensive cat fitted as well.
The new ULEZ is something different
they brought in along the same lines but now effects cars and no the P6 is not exempt from paying this even if it is tax exempt it’s due to emissions.
It’s just another way of extorting money out of the public