Possibly some type of Acer? Ornemental gardens so possibly not native, the bark was a stunning red colour and was readily peeling off.
No interactions present.
I did wonder about the Prunus, but if I recall correctly that's less shaggy-barked.
Anyway, the Acer griseum at Dyffryn Gardens is noteworthy enough to be mentioned on the Dyffryn Gardens Wikipedia page.
Lat/Lng: 51.4397, -3.3048
OS grid ref: ST094719