In the last two days I've come across two (2) references to this on the Net...and on searching that's IT. From the references it's some sort of oganisational/operational overlay for the South-East of England, particularly in 1940 with respect to anti-invasion planning for Sealion. Specifically... The operational area of the NZ division - 5th & 7th Infantry Brigade Groups and Milforce - stretched from Maidstone out to the coast north of Deal in ouine with Sandwich....and south then to Dover and Folkestone, then west again along the Royal Military Canal to Hay Street before turning north again back up to Maidstone...is referred to as "Area No.3 of the Aldershot Defence System" in the NZ Official History. Can someone tell me more, or route me to a map of the Defence System???