Cameron had decided to call the following 'boomerang' ear...I wonder what he meant by that?

"in relation to jumpers....kangaroos" replies BI ONLINE...you mean they hear a boom-via-microchip and then they jump? I've never heard a 'boom'...."it's an early warning system"...really?

https://www.google.co.uk/maps/@55.8791865,-4.9740478,3a,90y,138.31h,49.85t/data=!3m6!1e1!3m4!1sXfMFix5iJPrjjLCJbAeUVQ!2e0!7i13312!8i6656!6m1!1e1

 

let me see...having just had a look at 'green phantom' website and a search for 'forgotten tunnels/air-raid shelters'...I was then to wonder where Cameron might have....further inland...that location inland....go figure:

 

http://www.thegreenwichphantom.co.uk/2010/08/5639/

 

 

"the in-el-lan"....more of a radio/telecommunications system, then...rather than a shelter?