Why is "Brickendonbury Estate" trending?

Wikipedia Overview

Brickendonbury is an estate in the Metropolitan Green Belt, roughly halfway between the town centres of Hertford and Brickendon, consisting of several Victorian era farmhouses, a Georgian era mansion, several blockhouses, and modern facilities. Several of the buildings on the estate are listed in the National Heritage List for England, including the main Brickendonbury Manor, Clock Cottage, East Cottage, and Stable Cottage. The farm area of this estate has been continuously inhabited since at least the Saxon era, and several Roman coins have also been found here, indicating a much earlier presence. It was briefly home to the Stratton Park School. During World War II, the estate was occupied by Section D of the Secret Intelligence Service to become "D School," the first British school ever established for modern guerrilla warfare, which was later operated by the Special Operations Executive (SOE). In the early 1970s, the estate was used to film Catweazle, a television show about a time traveling wizard.