You have that backwards. All of Europe except for England is LEFT hand drive. Japan and England are RIGHT hand drive.Almost all European car makers, especially those from right-hand drive countries, such as VW、Audi、BMW、Mercedes Benz, have always been having the fuel door on the opposite side (passenger side) to the driver. I believe the fuel door designed on the driver side mostly from Japan and the left-hand drive countries. There original intention is to make the fuel door on the opposite side to the driver for domestic market. But it costs too much to move the fuel door to the other side for right-hand drive markets.
The side that the fuel filler is on is often dictated by the packaging of other components, especially exhaust, which is often put opposite the driver to avoid things like steering and brake lines, and parking brake cables on cars with foot operated parking brakes. For instance, most US trucks have the exhaust running down the right side, and the exhaust pipe is a side exit (instead of rear) so that it isn't exhausting directly on a trailer if towing. With the exhaust on the right, the fuel filler ends up on the left. This only really applies to vehicles that aren't designed for both left and right hand markets.