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Get an expert opinion on the wasps. Some wasps (usually of foreign origin)
are capable of demolishing brickwork. There was a well-reported case some
years ago where bricks could be seen and heard tumbling to the ground from a
house wall, having been removed by home-seeking wasps.

Of course if they're just the normal local variety just keep the bluebag
handy!

Cic.

I take it the wasps were removing the morter, not the bricks !!!

Dave