Help - how the hell do I get rid of a wasp's nest? Allergic guests arriving on Friday :-(

[Greensleeves]

We've tried diatomaceous earth and the little bastards just laughed it off

DH has been stung quite a few times just trying to uncover the nest, and we have guests coming on Friday one of whom is highly allergic

Any ideas on how to get rid of them?

OK I've got a man coming round tomorrow morning to get rid of them for £50

Thanks for all the advice!

You call a professional. It doesn’t cost much.

Ok, professional is always a good start...but in the event you need to again just buy some of the wasp killing powder from a diy shop and then puff it onto the entrance in the nest at night (in the dark). Obv more difficult if the nest is in the roof!