Dear Moderator
I can't be absolutely certain that the walled garden isn't just over the border in SO4565 as the castle is very close to the edge of the square. The Sweet Chestnuts are in the right place, I'm sure. The OS maps are a bit confusing as the Church appears to be over the border on one map but not the other. I guess you are all very experienced and have resources that I don't.
All the best