http://www.radarpages.co.uk/mob/ch/chainhome.htm
Straight from the horse's mouth!
Article from "The GEC Journal of Research", Vol. 3 No.2 1985 pages 73-83
(GEC = Marconi = BTH)
On the last page; shown as Dover on the map , but called Swingate, Kent in the list.
Regards,
Mark