Interestingly, I've just ran the question 'what happens if a cashier won't accept payment for fuel because you are wearing a crash helmet' past my mate who's a Police Inspector. He said if 'reasonable' (grey area, open to debate) efforts had been made to pay for the fuel and payment was not accepted it would therefore be a civil matter and the police would have no interest in the event. Just saying. He did however stress that 'reasonable' is the same length as a piece of string and was a very grey area. If it was filmed/recorded (helmet cam?) or reliably witnessed (mate) and clearly shows that you have attempted to pay and the cashier has clearly refused to accept your payment, despite your best efforts, it would be reasonable at that point to ride off. You would still need to pay for the fuel, but this could be done by posting a cheque (recorded delivery) or by 'other' arrangement with the owners of the fuel station. It's a lot of fuss and bother in other words but not a 'crime'. You have no legal requirement to remove your crash helmet for anyone other than for a Police officer, at their request, while carrying out their lawful duty. Another however, if the shop/petrol station has clear signage that you must remove your crash helmet as a requirement to be served then you are on a slippery slope as it's their 'bat & ball' you're playing with, their house, their rules as it were.
Alternatively as my mate said, have the correct amount to pay for the fuel in cash and simply leave it on the counter in full view of the CCTV. Sorted. Or just use pay at the pump petrol stations... Phew.
