On its website, petrol company Shell said prices can vary from region to region due to "factors such as distance from the refinery or distribution terminal to the petrol station and the number of customers in the region".

BBC: Bedford mayor calls for 'boycott' of expensive petrol

Mr. GEOFF SUNDSTROM (Spokesman, Triple-A): What's occurring at the retail level and at the fuel distribution terminal is a complete draining of their gasoline inventory, the cleaning of all the equipment and storage, and then a refilling of that storage with the new Ethanol blend fuel.

NPR: Marketplace Report: Feeling the Pain at the Pump

Fuel from Grangemouth is distributed right across Scotland, although other distribution points like Shell's oil terminal in Aberdeen and the Inverness depot have also been picketed.

BBC: Warning over petrol panic buying