Scouse magpies!!!!The ones we have around here wait until I have cleaned the conservatory roof ,then a bunch of them arrive and pull loads of lichen up off the tiled roof and it rolls down onto the conservatory roof .
Nightingales...Lucky you.3 or 4 Magpies in our garden or the field beside us not noticed any problems. Still have Blue tits, Great tits, sparrows, wren, robins about & nightingales.
Must admit I wasn't aware of their bad rep always think of them as pretty birds.