Thanks mattb, much appreciated.
Good to have another perspective having been messed around for two years and counting trying to sort out another matter.
The birds have quietened down, I think most of the noise was the sound of them breaking the roof structures to form the second access, from inside out. So hopefully the birds have no more renovating plans 
Just hope the problem doesn’t become worse whilst I patiently wait.
Am waiting for an email update from the SM of their progress.
Thanks again.