Pok Fu Lam Reservoir Road (Cable?) Hut [c.1938- ]

My first thought was...

I could imagine this being an intermittent sentry point between the Batteries of the Peak and Pok Fu Lam Reservoir encampments   (primarily the Forward Dressing Station noted by Dr Solomon Bard) I thought about A. H. Pott's wartime diary.  

Just before entering Aberdeen, about two miles along the road from the place I reached it, I ran into a barbed wire entanglement.  I immediately thought that the Japanese must be at Aberdeen and that I should be captured and probably die of pneumonia if not shot, which I thought was very discouraging after all my efforts.  

But looking back, in all likelyhood it is just a telephone cable hut or something of the sort.

Regards