Ivinghoe Beacon is close to the estate that is in what English town?
Ivinghoe Beacon:  It is situated close to the village of Ivinghoe in Buckinghamshire, the Ashridge Estate, and the villages of Aldbury and Little Gaddesden in Hertfordshire and is managed and owned by the National Trust. Ashridge: Ashridge is a country estate and stately home in Hertfordshire, England in the United Kingdom; part of the land stretches into Buckinghamshire and it is close to the Bedfordshire border.
Hertfordshire