Hello and thanks for using Just Answer.
My name is ***** ***** am happy to assist you with your enquiry.
On the basis you have an Assured Shorthold tenancy, even though the fixed term has ended, the tenancy continues on a "periodic basis" which means the same terms of the tenancy, including the rent, continue until either party serves Notice to end the periodic tenancy or a new Tenany Agreement is signed.
Therefore, until a new Agreement is signed, the current rent remains payable .
As regards ***** ***** increasing the rent, I'm afraid he can increase the rent however much he wants in any new Agreement. It is a case of you either accepting the new rental amount or refusing to sign the new Agreement. I am sure your Landlord won't want to lose you as a Tenant, so hopefully you can come to an agreement on the new rent.
If you can't agree, it is then open to either party to serve Notice on the other ending the current Tenancy. You would have to give the
Landlord 1 month's Notice, expiring on the day before your monthly rent is payable, and your Landlord would have to give you 2 months Notice in similar fashion.
hope this helps and sets out the legal position.