Wasp nest in loft - removal?

[aww999]

Me and the missus went away for about four months last year and missed the great british summer. When we got back in early autumn there were a load of dead wasps in a couple of the upstairs rooms, and they'd also got into the halogen downlighters from above (which feed directly into the loft). No activity to be seen, but clearly there must have been a nest up there over the summer.

We have just noticed some more activity, I put a load of junk in the loft last week and didn't spot anything but I stuck my head up there last night and there were a couple flying around in there. I am a waspophobic (I'm addicted to waspophobe!) so rather than bravely finding the source of the infestation, I squealed like a ten year old girl and ran back down the ladder.

Spoke to Rentokil this morning, it's £90 to get someone out to exterminate them, but they're not sure if they'll be able to do anything. They say wasps never return to the same next twice, so if there was a nest up there from last year it will be empty; but it's too early for them to have got far with building a new nest this year so they might present a difficult target.

Any PHers with any thoughts as to the best way to proceed? (Bearing in mind I have never been stung by a bee, wasp or hornet and intend to keep it that way!)

[aww999]

Thanks for all the advice guys, I rang the council and booked it through their pest controllers, £50 charge but that's half what Rentokil waned. It sounds like it may be neccessay to tackl the problem in stages but just have to see how it goes.

I hope the guy is not risk averse though; my loft is four feet high, unboarded, and crammed full of stuff so no chance of moving quickly if 10,000 wasps go insane in their lust for sweet, sweet human flesh.