Thank you for that additional information, that will be helpfull in allowing me to advise you today.
There is a very strong market at the moment, and many properties are certainly increasing in rent charged.
The landlord should and has informed you of the increase to take affect. Your option is to either accept or reject the new rent. If you do the latter, then you would need to leave the property.
However, you could reject the new rent and see if the landlord will back down or accept a smaller increase.
I would advice not signing any new tenancy agreement until you are satisfied with a new rent cost.
You could continue on a rolling tenancy as a periodic tenancy tenant, month by month. The landlord may not agree. If he does not, then he will need t9 serve a correct s.8 or s.21 notice on you to leave. This will give you a few more months grace to fine a new property. If you fail to leave by the end of the notice period, he cannot evict you, but would need to go to court to seek a possession order, that will give you be pem more time to find somewhere. During this period keepmpaying your old rent and don’t sign an agreement for the new amount.