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goodsoulette, I think the worst pest is probably pigeons in lofts, sometimes hundreds of them, they usually have to be shot and then seal hole to stop more getting in, then locate all the bodies in the loft that is usually inches deep in pigeon crap the loft is like an oven and you have to wear special suits and masks, then usually all the insulation has to be removed and then all the timbers scrubbed and disinfected, but those jobs pay exceedingly well!!