Whats your advice

Sadly police will do nothing unless they are dealing. You will devalue your own property if a complaint is upheld re drugs next door and fires. As it it if you sold and didn't declare all the problems to new owners they can sue you now. Part of a selling contract states any problems with neighbours. This isn't fair but it's contract law now. Also be very careful about reporting drug use to police. Best done anonymously as some dealers and users are not nice people

With regard to the cannabis smoking which you have reported try writing or emailing to the Chief Constable and the Police and Crime Commissioner (PCC) for your Police authority.

Up dating on what as happened up to press Police phone me up yesterday (I told him everything which is a lot more than I wrote on here) He told me he would take some photo's and try to find out who the land lord is to show them the photo's and He paid them a visit to warn them he also said it might help but can not promise,so my fingers are crossed,
I am shocked on how many people have gone through this or still living with the problem,
Thank you all, you all have been very helpful

Why don't you write to the landlord, asking him/her to contact you about the tenants and post it to the address next door, markled "For the attention of the landlord only" and "Private and Confidential".

These people should pass it on to the landlord.

Your council should have a list of all landlords. Ours do. He/she shouldn’t be hard to ‘ find’. You’ll probably find they’re breaking their tenancy rules, and be kicked out. Are they students stuck there due to the lockdown? We’re a student town, and some have had to stay here. All well behaved though, because if they’re not, the university takes matters into their own hands, and will remove them if they don’t comply with the rules. It sounds awful, I hope you get it sorted.