Top Secret Dereliction

If you wander along any of the waymarked paths through Morgaston Woods on the National Trust's The Vyne estate you'll come across this sorry bit of dereliction. 

They were once sheds used to store ammunition in WWII ... or may not as they may have been decoys to protect real units nearby!  Anyway, today they are deemed unsafe; hence the wire fencing.  They are also not totally original as, like Trigger's Broom, have had new supports and metal sheeting.