Tongue-in-cheek JBW, though with a lifetime spent in electrical engineering I have never ever come across the @ symbol yet .
Not that it's of the slightest importance anyway.
There's a deeper significance to the fuel duty; so many people don't have to/won't pay into the various tax-gathering schemes the government uses that the catch-all schemes like booze, fags and fuel are the ever-reliable stand-by's. Fuel is a necessity, no doubt about that, but ever increasing government spending means the duty won't be cut no matter what Mr Wilson etc may like to campaign for. Someone has to pay for the foreign wars/health needs/housing for....nah, I'm not even going to say anymore.....