In article ,
harry writes
https://www.express.co.uk/life-style...changes-May-20
18-diesel-cars

Plus diesel emissions to be lower.
So Advisory Notes now become Minor Faults. Big Deal

Failures are spilt into Dangerous and Major to discourage drivers from
driving away to get a "Dangerous" fault fixed, which is illegal at the
moment if it renders the vehicle non-roadworthy. So just making that
clearer.

Diesel particulate filter must be present and doing the job it is
intended for which will help keep the really stinking diesels off the
road.

As a diesel owner I don't have a problem with that.
--
bert