I agree with Wicky's idea of the PPE, unless you just hapen to have a bee keepers outfit at hand.
Get a can of Wasp Nest Destroyer...
https://www.ebay.co.uk/sch/i.html?_odkw ... r&_sacat=0
The foam spray type not the powder.
Get as close as you can & spray the lot in the hole they use the most for ingress.
If you need to use a ladder...Just be very carefull & don't freak out if they come for you & step back to get away...your on a bloody ladder !
It is quite wet so depending on what your cealing inside is made of you might want to move stuff away from directly underneath.
If you have a pond do not get any of the foam in the pond, the can will probably have a harmful to fish symbol in the warning bit. Same for any powder versions BTW.
Also this is best done either eary morn or late eve.
The wasp nest this time of year is dying off now, the queen is probably dead, all the larve are now the next years queens & the fertille males...(one job wasps, shag a female wasp & die...)...The pregers queens now fly off to overwinter to emerge from the stasis & start to make a new nest. So the worker wasps are now out of a job & seek out food for themselves, jam sandwij's, fallen fruit ect
Wasp's don't reuse old nest but can still use the same location to buils a new one, just pot luck if they do.