9 Group area, was located in a bunker on Langley Lane, Goosnargh, 1 mile (2 km) east of Barton Hall.

[2] After the war the Royal Observer Corps 21 Group Headquarters and the Western Sector Control of the United Kingdom Warning and Monitoring Organisation took over the bunker.

[2] The Filter room contained a map table showing the British coast from north Wales through western Scotland.

One of the WAAF officers in the Barton Hall Filter Room, Eileen Younghusband recorded her experiences there in "One Woman's War.

[5] After the war, Barton Hall itself was the site of the Preston Air Traffic Control Centre which provided the Area Control service between N52.30 and N55.00, with London ATCC (at Heathrow and later West Drayton) to the South and Scottish ATCC (at Prestwick) to the North.