I think that I may have found a cure for "noises in the roof" ie Fouine. I have the anti mouse electronic boxes and have used them for over 20 years and they are very effective in keeping the mouse population at bay, although they do need to be replaced every few years.
I plugged two of these devises ( I have the larger model) in the bedroom below the noise and immediately all hell broke loose! There was activity for about half an hour and then nothing. That was a week ago, and no more noise, so I may have cracked it. Hope I haven't spoken too soon.