Wasn’t too much here but still worth a visit if you’re in the area.
Some history from Wikipedia..
In 1957 the Herstmonceux Castle grounds became the home of the Royal Greenwich Observatory and remained so until 1988 when the observatory moved to Cambridge.
Several of the telescopes remain but the largest telescope, the 100 inch (254 cm) aperture Isaac Newton Telescope was moved to La Palma, Canary Islands in the 1970s. The estate provides housing to the Equatorial Telescope Buildings, which have been converted to an interactive science centre for schoolchildren. The empty dome for the Newton Telescope remains on this site and is a landmark being visible from afar.