It's B's right of way but the gap is RIGHT next to them.
A has to reverse back round a windy (badly drawn) road with loads of kids and cars around.
B was shouting all sorts at A after A appeared mildly incredulous that B wasn't reversing. B's wife was frothing that A was incredulous. A was fucking incredulous.
Is A the unreasonable one?
I already think I know true answer to this.