Okay thanks for the advice. I would've gone for the bin-bag approach, but I think I'd need some industrial sized liners to cover up this one. Seriously, it is absolutely massive - like I say, I never realised that wasps could build something so huge. I guess it explains the unusually high number we had last year in the garden though...

I was just wondering on two more things - firstly, is there a way to stop them from nesting in my attic again? Secondly, I've seen some spray-based products that 'dissolve' wasp nests - has anyone had any experience with these? Do you think that they'd work with a nest as big as mine?