[2] In February 1461 the final skirmishes of the Second Battle of St Albans took place in and around Sandridge as the Earl of Warwick, for the Yorkists, retreated towards Nomansland.

Sandridge was one of the earlier homes of the great English general, John Churchill, 1st Duke of Marlborough, and his infamous wife, Sarah, a favourite of Queen Anne.

It was the first of a group of stations dedicated to Diplomatic Interception with rows of radio operators listening to the wireless traffic between Germany, Italy, Tokyo and other enemy embassies around the world.

After the Second World War it became part of the Diplomatic Wireless Service under GCHQ and in 1973 the site was taken over by the Home Office for police research.

It is home to a small grass airfield to the north, named Coleman Green Airstrip which is used for general aviation.