Okay I thought I'd start this for when they inevitably show their faces!!
Sorry all the threads have different titles 
I have a slight update - I managed to catch the nice neighbour at the other side (I think he'd heard the commotion and was loitering about waiting for me
)
He was gobsmacked! Apparently he's lived here for thirty years and has never heard anything like it. I told him I'd keep him updated and he asked if i wanted to come in for a cup of tea, I politely declined hahahah. Glad I now have a nice normal neighbour on my side!