I said that I would confirm what we spoke about.
The police would deal with this for you and if the person has given a bogus name, they should pursue the other tenants and partygoers to get the correct name.
It might take some time but that should be the case.
If the police abandon it, you potentially have 3 defendants.
The bogus defendant if you have a correct name, the named tenants from next door and the landlord.
Using the “but for” test, then block for the landlord allowing these unwholesome tenants into the property, your property would not have been damaged.
If you threaten the landlord with civil proceedings as a co-defendant with the tenant and Mr anonymous, he maybe more forthcoming with the identity of the tenants.
It would be worthwhile having a quiet word with him first telling him what’s happened and asking for the names of the tenants. I would also give him the crime number and tell him that the police are looking at this because the last thing he may want the police coming round to his property.
If ultimately he is unhelpful, you can apply to court for a court order called “pre-action disclosure” which is a court order to make the tenant. If threatening any court proceedings, give a deadline before which they can reply to avoid proceedings.
Once you have all the details, you can if you proceedings with Mr anonymous as first defendant, the named tenants as second defendant, and the landlord as third defendant.
If you proceedings against Mr anonymous you are going to have to find out who he is and where he lives. Best wishes.