On Sat, 14 Nov 2020 09:53:51 -0000, "michael adams"
wrote:
snip

Indeed. In Richmond Park there are, or at least used to be, old style picket
fences, split wood uprights and wire, put around the trees to protect
them.

I think you will find they are more typically called 'Pale / pailing'
fences (probably a modern version of a wattle fence).

Picket fences are normally evenly spaced flat wood 'pickets' on an
Arris rail of some sort.

Cheers, T i m