Ask an Property Solicitor. Get an Answer ASAP.
I have been asked to deal with this for you.
You need to make a complaint to the council. Do it in writing because you will get fobbed off on the telephone.
You need the council to issue a section 215 notice.
Here is a little reading from one local authority although the law is the same nationwide: https://www.oadby-wigston.gov.uk/pages/untidy_land_notices_section_215_of_the_town_and_country_planning_act
The council have exactly the powers to deal with this. If they say it’s not within their remit, make a complaint to the Local Government Ombudsman.
You also have a claim to make against the neighbour in private nuisance although to be honest, you shouldn’t have the trouble or the expense of dealing with that the local authority should do it for you.
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