In UK housing law?

Ground 14 is about, nuisance, annoyance or criminal conviction, they have already been given notice to leave by their landlord and haven't, so the landlord has taken it to court to get a court ordered eviction, so the landlord , maybe the police, social services, neighbours etc have given evidence to the judge and a decision made they are guilty of the ' nuisance, annoyance or criminal conviction' basically they are anti social and possibly already hold ( previously convicted) an IPNA (Injunction to Prevent Nuisance and Annoyance) or what was previously called an ASBO (Anti-Social Behaviour Order) so the landlord is given a court ordered eviction to enable them to legally evict them

OK, thanks, so they have already been found guilty in a court. Thanks for clarifying.

Sounds like it.

He has been found guilty of violating his lease/breach of contract. Cause for eviction.