Here's the StreetView
version so people can 'drive' it.
This is one of those frequent situations where the lack of signs to reinforce paint (which is often erroded or has vehicles covering it) would make the situation so much better for a non-local.
There's not a lot you can do once you find yourself stuck out in lane 2, other than indicate your wish to return to lane 1, coupled with lots of mirror checks, and hope a kind soul eases to let you move.
In the exiting a RAB situation, this too is very common with people wanting to always be in lane 2. If/when you are back in lane 1 you can 'undertake' but with extreme caution. As Horse has suggested this is a common situation for motorcycles where we find we could easily pass all the drivers not 'getting on with it in lane 2'. Sometimes I do pass, steadily, with an eye on each vehicle for the slightest hint of movement that they are going to return to lane 1.