I guess it depends on your point of view, as an owner or prospective buyer. As a buyer there's less to choose from, and current fuel prices won't help people decide to sell a 20mpg car but to an owner maybe it's a precursor to prices going up. If the pool of cars remains the same (the numbers of taxed and SORNed cars on HowManyLeft.co.uk should tell us that) then maybe people are hanging onto what they have with a view to the long term.

HowManyLeft is a useful tool, but beware - it's like disappearing down a rabbit hole!