What are the Clapham Common tarmac bumps?

What is this? Clapham Common has four of these blighters and they’re clearly a part of a conspiracy. Someone on our forum suggested Victorian rubbish, another said more air raid shelters, a friend thought old basketball courts. Any clues?





I think: Old playground.
There’s a few of them dotted around the common. As a kid, I heard old bomb-shell bunkers…dunno how true thou
Apparently during the war, they were anti-aircraft placements…
Curiouser and curiouser…
according to Wikipedia they are Victorian roller skating rinks… no, I didn’t believe that likely either… I have been tryinbg to find out myself & I have heard barracks for the Canadians who were stationed there, air raid shelters or placem,ents for anti-aircraft placements… I think the most frequent thing I have heard both locally & online, is the bomb shell bunkers. I would love some kind of visual, written or photographic, evidence though!
I’ve been looking into this, visiting the local history section of the Battersea Library, & talking to people from the local area, it seems that I was on the right track with Anti-aircraft gun placements. I have spoken with someone who remembers them being there in the north west section near Battersea Rise. I just want to confirm the others, along the West side of the common were also placements, too!
Wow, brilliant – thanks Magdalena!
I think the may be water reservois?