"Doctor Drivel" gurgled happily, sounding much
like they were saying:

Not in London as they have filters. Diesels busses shake like hell on
idle. The sooner they are electric hybrids the better.

Riiiight. Now, that would be "Electric hybrids" with the electricity
generated by what power source...?

Petrol.

Not the 1.9 diesel engines already in use in diesel-electric hybrid buses
in London, then...?