Blocked up some of the holes under the tile ridges to reduce entrance/exits with bubble wrap and managed to blow some powder underneath the remainder.
Retreat! Very quickly I noticed reduced activity in the immediate area and then none. Nothing today.
There was no sign of a mass exodus in search of the offending wasp killer, nor masses of dead wasps. I'm presuming the nest, wherever it may be is now full of exterminated wasps. If that is the case the bit of powder I managed to squirt has had a significant impact. There are not even any survivors hanging about.
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