For those of us running Diesel heaters and like to pay rebaited fuel prices currently around 70p-90p per ltr. The latest edition of my map dispensing small quantities of Kerosene, Red/Green Diesel from the pump into your own containers. Over 250 sites listed. https://drive.google.com/open?id=1GQnsvcStI03X8XVDjaMorgAAPcKNfMPD&usp=sharing
It could be worth researching this: There are also marinas where you can walk up to the fuel berth and fill a can with red diesel. A lot more expensive but if you turn up with a black can they will sell you some. Some of these are behind security gates but some are open to walking from the shore side. Turn up in some sort of boat, no problem.