There's a path round the back that is shared access to the wheelie bins through my garden so I can't legally stop them - but every time I look out the back window one or other of them is sashaying down my path, must be half a doz times a day. Also seen their friends come round the back and along my path to their back door!! Then on Monday next door on the other side went away on holiday, and yesterday I see him next door going in their gate (not shared access) and having a good nosy around their garden 
She is in her 80s and just nosy but he is def creepy and I don't like him.I have got plans to privatise our garden and fence off that path but that will be for next year if we stay here. For now, I just want to know how many times a day they're in and out and what they're doing. I can't stand at the kitchen window all day watching, so wondered if there was any device that would sound a bell or buzzer in the house when that back gate is opened or when one of them walks down the path. What would I look for? I don't want anything fancy that works on apps etc as we don't use iphones and the laptop isn't always on, just a simple infra red beam or something that alerts us. Any ideas?
But he's 76 and might drop dead........ maybe best not! Plus I think the wife is the kind who would trigger it more just to be smart, she's got form in this village which I didn't know about until lockdown ended and I started going to the hall for coffee mornings etc. Talked to people and found out she fell out with almost everybody and was even flung out of the Bowling Club and the Village Hall Tea Committe... Oh my god the sheer awfulness of it all