Mill Island Warning Area

[PiperCubFlyer]

Having downloaded the latest database update for my Garmin 296 I note that we appear to have gained a new piece of airspace just to the southwest of White Waltham entitled the Mill Island Warning Area. Anyone got any ideas what it actually is and how it got into the Jeppesen database. I am sure I remember from my days living in Woodlands Park that Mill Island was a Caravan Club site. Surely CC sites don't warrant restricted airspace these days :}
http://lh3.ggpht.com/_PdemnBAYk4A/SgXexm9HHHI/AAAAAAAARRY/lSQLRZlE8-k/s800/Mill%20Island.jpg