Wicked wasps

There's a wasp's nest in the wall of my neighbour's garden. Up until now they have been doing a good job foraging for insects to take back to their nest. They are not fussy; last year I watched them tucking into a slice of ham with each wasp carefully cutting a piece off with it's mandibles before airlifting it back to the nest. Usually however, they predate caterpillars and other pests, and occasionally a dead bee they have found near the hives.
It's a good system - the wasps take meat back to their nests to feed their grubs, and the grubs secrete a sugary solution to feed the wasps. Everybody was happy, until now...
The wasp nest is starting to die. In the last few weeks the virgin queens have hatched and got mated and will soon be looking for somewhere to shelter through the winter. The old wasp queen is no longer laying so many eggs and she will die shortly. Fewer eggs means fewer grubs, which means less sugary solution for the adult wasps, who are hungry.
So they start to look around for sugary food and anyone picnicking or enjoying a drink in a pub garden this time of year knows the consequences - wasps are a pest.
But if you think you have problems, pity the poor bees. Thus far they have been working hard bringing in nectar and making honey. They need that honey to see them through the winter and well into spring next year. Without that honey they will die.
The wasps will die soon anyway, but right now they are hungry and determined to steal the bee's honey. So all day long they probe the defences of the hive, trying to find a way in. If the colony is weak the wasps can soon over-power it; a wasp can sting many times but a bee can only sting once, so it doesn't take long for the wasps to kill the guard bees and in the course of a few days completely strip a colony of any honey.
It's a sorry sight - a pile of dead bees, no food and few house bees wandering around aimlessly.
To help my bees protect their precious honey I've narrowed down the hive entrance so that only one or two bees can get into the hive at a time. It means there's a bit of a queue at busy periods, but it also means the guard bees can easily challenge any wasp.
But it's tiresome with so many wasps from that nest just 20 meters away, so it's time to make some wasp traps.