He cannot increase the rent until it comes up for renewal which is probably February unless he didn’t renew it at some stage in the past and it just became rolling/periodic which case he can increase it 2 months notice.
But if he’s increased it and renew the tenancy, then he cannot increase it again until the next renewal.
If he hasn’t renewed the tenancy but it remains rolling/periodic, he can actually increase every 2 months.
You are at liberty to take the matter to the rent tribunal to have a “fair rent” set but be aware that the rent set by the tribunal may be higher than you are being asked to pay.
If it’s lower than you are being asked to pay the landlord may not like it may give you a section 21 notice to quit although that right is likely to be removed in the not-too-distant future although we don’t yet have a date for that.
So you could win the battle but lose the war.
I’m sorry, I know it’s not the answer you wanted.
Thank you for letting me assist you with your legal question. I am glad that I was able to help.
I am not certain whether that answers the question for you or not, but I am happy to answer any specific points arising from this.
It will be my pleasure to help you again either further with this or any future questions you have