One tenant (the wife) asked to remove other tenant (the husband) from the tenancy agreement

Other

Hi,
I have a AST with a married couple who seem to have relationship problem in recent months, and yesterday the wife asked me to immediately sign a new AST with her only, so as to stop letting her husband living in the house with her, but the husband told me that he does not intend to leave. The wife even changed the lock yesterday, so her husband can no longer come into the property.

I signed the contract with both of them more than a year ago, and now in 'periodic'. I am not sure what to do with this situation. I don't think I can end the contract without consents from both tenants, except if I give them two months' notice. Am I right?

My other headache is, the husband claimed he is my tenant as well according to the AST, so I should give him a copy of the new key. Can anyone advise what my position is like? Any potential legal consequence if I do/don't give him the key?

Thanks.

Tse