[Nicholas V Saiz]

I have a very unusual image of a cloud above Whitechapel in London taken in may 2015.
There was near complete coverage of altocumulus and a few small cumulus humilis at a much lower level. In the altocumulus there was an almost complete perfect circle of a gap in the clouds. It was immediately above the cumulus humilis, could the circle have been caused by the shock wave of the thermal that caused the humilis hitting the higher level clouds?
I have seen fallstreak holes, and this could is certainly a perfect circle, but it is filled in in the middle so I can’t see it being caused by this mechanism.
Here is the picture:

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