Sevenoaks pointer to Biggin
As a slight aside to the discussion but still relevant and I expect of some interest, in the 1920's, Aerial Lighthouses, such as this one in Tatsfield, were installed to guide aircraft around the country. Similar systems also existed in other countries.
There is a restored example of just such a beacon at North Weald.
There is a restored example of just such a beacon at North Weald.