A Stafford Knot entwined with a symbolic plant (a Tudor rose, I should think). Strange.
Anyway, this is the design on the gates at Maer Hall, a very grand building indeed. I can't find out anything about this combination of or why it should appear on these gates.
It's likely the gates were built in the late nineteenth century when the Harrison family, a Liverpool ship-owning family, lived at the hall.
In the sunshine, this design fair dazzles one...