Looks like an alternative to the MOD standard:
http://www.outdoorsmagic.com/news/article/mps/UAN/4733/v/1/sp/
Ted W
http://www.outdoorsmagic.com/news/article/mps/UAN/4733/v/1/sp/
Ted W
Apparently they're going to be £25!!!!!!!!!!!!!!!!!
And Alpkit is giving away a free one - see their website.