I'd speak to the police again in your shoes. The other person that might be able to help/point you in the right direction is if you can find out who your local Child Protection/Safeguarding officer is at the local council.

I can't stand hysteria or vigilante type action (as I've said before on here it cost us our home when my sister died), however no adults should be approaching a 5 year old child about staying overnight without prior discussion/permission from the child's parents. That is odd, and concerning, behaviour imo.

If it was me I would have gone round and done them both in, you can't take chances with paedos.

Its like Iraq and the WMDs thing, I know there weren't any, but just ask yourself, what if there were? You can't take chances.

Everyone is a suspect. Guilty until proven innocent.

I would say you have to be firm, straightforward and honest with the neighbours and say if you even get a sniff of something dodgy again you'll go to the police.

My family has had neighbour trouble(I'm 17 and still at home) and we've had things thrown over our driveway weekly and a hammer put through my dad's car window, obviously we can't prove anything but it happened within a couple of days of an argument with them.

if you think these neighbours are the type to do this sort of thing then speak to your local copper/PCSO, just so they know that if anything goes on they know who to speak to, also recommend getting some cctv installed

I'm not sure how much use some CCTV would be to be honest, because it wouldnt be able to look onto next door's property anyway.

it's a deterrent more than anything to stop any damage to your own home