There is a woeful amount of information on this site. There is some evidence that it was a WWII Ministry of Supply Ammunition Depot. The formation and construction of the bunkers is similar to other ammo storage sites both retired and active.
The location comprises 24 identical concrete bunkers and a few brick bungalows. It appears relatively untouched since the war and although there’s variation in terms of access (some were built to allow vehicles in, others weren’t) they are mostly identical.