What the hon. Gentleman is identifying is the fact that fuel duty is a very crude method of sending an environmental message to motorists. Does he think that, in the long run, the best way of smoothing this out and sending that signal to motorists will be to move towards introducing road user pricing, not fuel duty, as a mechanism? That will also deal with the rural and haulage issues, as well as the level playing field issues.
Copy and paste this code on your website