To tell landlord of next door neighbours?

There’s no such thing anymore tenancies don’t come up for renewal they just turn automatically into rolling contracts. This is all the new tenants rights thing. It’ll be very complex for the landlord. The best way is through social services if you’re concerned about children.

You can put what you like in a tenancy agreement but only a court can enforce it. The bar for anti social behaviour is very high - rightly so. It would involve official bodies like police etc, multple statements by independent witnesses, film and/or video.

If Mrs A and Mrs B (both homeowners) have a robust argument then they have to find some other way to solve things. However if Mrs B rents then it is clearly wrong for Mrs A to be able to weaponise the fact that Mrs B is a tenant to try to get her evicted. A court is not interested in interpersonal arguments between two individuals without some other cause - unreasonable noise, threats of violence, racist abuse, drug dealing etc.

Landlords who insert themselves into interpersonal arguments are risking a charge or harassment from their tenants. Its the tenant paying the LLs mortgage, not the snitch next door.

Right, so no eviction actually took place.
Good outcome for everyone but there is no reason to believe that the same thing would happen here and OP could end up living next to someone very uninvested in the condition of their house and/or keeping their LL happy.
This is assuming the LL cares enough to do anything in the first place.

The tenants left after about 6 weeks. She did start court proceedings but they left.

Who is the LL? If its a local authority or Housing Association you might get somewhere otherwise probably not

If the police have been called and attended, I think they inform SS anyway if there’s been a domestic (according to my DH who is in the job). I’d call police and landlord. My tenancy agreement said that causing a disturbance to neighbours was breaching the tenancy agreement.

Agreed but Op will be living next door to someone who doesn't care about eviction, might not be great

If the insurance is covering the non-payment of rent it doesn't matter how long it takes. All part of the fun of being a landlord (sarcasm)

It would be hoped so but it doesn't speed up the process and people who are in that process don't have anything to lose.

Landlord's insurance may cover all this

She might have "won" but then she would have had to go through a lengthy and expensive eviction process. At the moment evictions are taking up to a year, thats a year of no rent and people living in your house who hate you and their neighbours.
Its VERY VERY unlikely a LL would even try and evict because neighbours are (justifiably) upset. MIL used to own a property and the Tenants stopped paying rent, she was also contacted by people living nearby to complain about their behaviour. It took her over 6 months to get them out, in fact they just did a moonlight flit before the eviction hearing. In total with damage and lost rent it cost her around £10K.
As I said VERY unlikely a LL would evict under these circumstances.

This. The children's soft is paramount

I.have a friend who took her tenants to court with a contract with the same clause in and won. She had statements from 2 different neighbours complaining about loud noise music playing late at night on numerous occasions and swearing loudly at neighbours DC when they were playing in their own garden and when neighbours complained to them they got a mouthful of abuse too. They got eviction order but had to show contract in court. Tenants didn't even show up to court.

From the OP’s past 😆

How do you know the person is a drug dealer?

I get that and its not unusual BUT as you know eviction is very hard and expensive even if a contract is breached.
I agree it SHOULD be easier to evict for anti social behaviour but its not

No, not wild generalisations...

Actual previous experiences, I'm not saying all tenants are like that, I'm pointing out some of the outcomes that could be associated with tenants who use drugs and have kids they dont look after... as can be insinuated in the OP

@Ezlo a landlord has the same ability to evict for anti social behaviour as the council!!! I would inform both the child services and the landlord and perhaps think of phoning the police to help get the asbo going.

That's just some issues I've dealt with on previous tenants.

Bit of a wild generalisation then.

It's not easily enforceable though.

Ring social services for the children and keep ringing every time there's an argument.

Don't bother with the landlord, instead ring the anti-social team at your local council, they're usually part of environmental health. Report it to them as they have more clout over anti-social behaviour and can pressure the landlord to evict whereas if you go to the landlord directly there's every chance he/she will just ignore you. Report to the council cil every time there is an incident.

Every time you hear arguing/place being trashed/see drug activity, ring the police and report it.

When it comes to anti-social behaviour you need a multi-agency response and you need to be a thorn in their sides because that's the only way they will join up and take enforcement actions.

I have an anti social clause in my standard contract to protect neighbours.

Really?
Great in theory but do you know how much time and money an eviction would cost (as a LL I am asuming you do)
Of course it should be easier to evict someone who breaches their Tenancy agreement but its not so the LL will need to be pretty motivated to do it and a neighbour being upset might not be enough.
I am sorry OP, its a crappy situation but I am not sure the LL is the solution

What do you think the landlord will do tell them off ?

I have a clause about anti social behaviour and complaints from neighbours in my contracts. I'd give a warning that might be all they might need to quiet themselves.