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It makes no difference whether he has permission from the Land Owner or not
The tenants agreement is with you
If your agreement states not to alter, then the tenant is in breach of contract
In any event you would have expected the land owner, if he did agree to have put this in writing and your tenant would have this
So yes, your tenant is in breach of contract
Can I clarify anything for you about this today please?
You can do it yourself.
You serve a notice to quit
Then if they don't go you seek an Order for possession from the Courts setting out the breach.
Does that help?
You just prepare one yourself. If you follow a Section 8 notice template that gives you an idea
Google search it
Can I clarify anything else?
You need to complete form N5 - http://hmctsformfinder.justice.gov.uk/courtfinder/forms/n005-eng.pdf
Send it to Court.
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