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Originally Posted by
Blocking up the air-brick in this weather for a short time should be
ok, and deter them if they're about to build a nest.
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I agree. Will be fun though to see a few hundred wasps going doolalee when they cant get back in and then OP has to close all his windows for most of the day (if not longer) to avoid a sudden in flux of the angry buggers, especially in this weather!!