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Defo wasps Azz I'm afraid and but some folks (eg. me!) are allergic to their stings. There seems to be loads this year. I'd have a look on Yell.com for an exterminator if I were you.
I think the council here get rid of wasps for free... still not keen on killing them tho. I used to think they just 'smoked' them out and then sealed the hive/nest!
Definitely wasps Azz ....... we had nest in our loft a few years ago, ost us £20 odd for someone to come in and destroy it (not the Council though)....