Old nuclear bunker?

Dont assume cold war just because it's concrete.

It could be a gun enplacement from before the turn of the century.

Google maps shows it's a water store
Theres similar stuff all over the place.

Lots of different uses.

Some look like bunkers but are nowhere near as intetesting. Some look like nothing but are more than meets the eye.
Some are like a tin of ronseal.
NO it's just there to hold up the hillside from when it was built. It's the one about 2/3rds the way up windy ridge isn't it on the eastbound.
It's all to do with the fact the 62 is built on a peat moor and kept shifting while under construction and they needed to keep it all from sliding back.
Off at a tangent here, but having rode through Albania last year on part of a motorcycle trip, there is untold thousands of bunkers and pill boxes all over the place.

When not being run off the road or disappearing down truck sized potholes, it turned into an interesting distraction to spot these things literally everywhere. A lot of the locals were trying to find a use for the nearby ones....a garden shed with 2 foot thick walls might be handy?