Not your usual aircraft activity

I think a lot of us are pretty used to large bombers (no, not those bombers) flying around recently, but occasionally something a little bit interesting flys over, like this morning, I heard a fairly low helicopter go over. Usually, it’s the local air ambulance, or any one of a variety of military helicopters, sometimes small civilian ones, which this one turned out to be, when I checked it out on ADS-B…

Apparently the missus fly’s it, the landing pad was formerly a tennis court. The house used to belong to HM The Queen…