I think the confusing aspect is the way the markings that come down the middle of the road from top right, which look like the markings that divide the northbound from the southbound lanes, don't show any point where a southbound road user who wants to turn right could properly cross those markings - I would expect to see the southbound lane split in two, rather than having (as appears to be the case here) a give way marking in what appears to be the opposite (northbound) lane. Having said that, I'm not sure that's the worst feature of this junction.
Certainly very confusing. I wonder if there's an expectation that few vehicles will turn right EXCEPT those coming from the side road (to the East) PaulSmith highlights.
i.e. most NE->NW travellers will be coming from the NE corner of the green, so could use the road along the North of the green. But locals could confirm ...
hatchings - can't find the relevant HC paragraph, but I think hatching with a dashed boundary is an advisory
Stay Out ( as opposed to bound by a solid white line = definitely
Stay Out). Bloody stupid anyway, because drivers are bound to drive straight over it