Richmond Park is a bit different, festooned with stupidity like this:
At least it's obvious there that the park creepers hate cycles and apply speed limits to them.
Hah! Richmond Park - probably
before those signs I used to have a couple of commuting routes that went through it, back in the '90s. Was once pulled over by parks police whilst cycling uphill - for "wobbling". On asking how much I was "wobbling" was told "About a foot. It stopped me being able to overtake you". In those days the HC used to say that cyclists may be unable to maintain a straight line ... I pulled out my copy (opened already at the relevant page) but was told "I don't care what the Highway Code says, if you get in my way like that again I'll nick you".
TBH it doesn't sound like the attitude of Parks Police has changed much.