SOG-----read your post with some interest.There are many streets such as you describe where I live , an old mining village.I am not a legal person ,but am doubtful that there are specific "back street laws".
These lanes must form part of the road network where you are and be used for other vehicles as well , such as Ambulances , fire engines , delivery and workmans vans, and so on.
All these drivers will need to be as careful as you are as they go about their normal routines.
Children will always play in these lanes ,and whilst it may not be the wisest place,the responsibility for their care is ultimately that of their parents.
All I think you can do is to be as careful and vigilant as you can as you drive along the back lane.
If an accident were to occur , heaven forbid , then I think the normal proceedures for any accident would apply.
It must be a really tense situation for you every time you need to move your car , but I am not sure what can be done about the matter if anything.I am sorry not to be more helpful .Best of luck.