The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 11/09/2021. It remains the responsibility of any pilot to check for any changes before flying at the same location.
Watford Borough Council does not allow drones to be flown in any of their parks. At least that is what they are saying on the website. On the byelaws they are not saying anything about electrical powered model aircrafts or drones.