In answer to why a music teacher would complain about someone practicing music, I would guess it is because she is usually paid to listen to people practice while, in this case, she has to listen for free!

I am not supporting the complainant and I think if this action becomes the norm, it will severely affect many folk musicians who simply cannot afford studio time for practice. I also think that the council EHOs have been both wrong and heavy handed. Fiona desrves all the support she can get