WW2 Deep Shelter. 2012

I've had my eye on this shelter for quite a while now but it's always been completely inaccessible, Until now.

Harpenden WW2 Air Raid Shelters, April 2012

Whilst researching the WW2 shelters in Luton I got onto thinking that if they had shelters built there surely some of the surrounding towns would as well?
So after randomly typing in towns near Luton into Google, Harpenden popped up with 4+ shelters scattered around the town. Bingo!