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Thanks for your question.
I'm very sorry but yes, he can demand and then sue you for this money if it's owed as back rent. The fact that you have not executed a new tenancy agreement does not effect this. You are now occupying the property as a statutory periodic tenancy, which means that the tenancy continues on the same terms as your previous tenancy but from one rent period to the next (so month to month if he you pay your rent mostly.
If you can't afford to pay him now your going to have to negotiate some form of repayment plan with him
Sorry it could not be better news.
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