Andy. Report them immediately to the Ag Dept and they will eradicate them. We don't want any possibility of European wasps getting a foothold in WA as they are a major pest.
They will sting without provocation.
As a boy back in the UK we thought it was great fun to put a lit banger firework into the holes they use for their nests.... great fun until they swarmed out in a rage and I got stung many times.:(
Do not delay with this as they spread like wildfire.
Good luck.
Alan.

