@Karl11 well I understood a tenancy can be ended at any time by mutual agreement (eg deed of surrender) just as before (just like a tenant can voluntarily pay rent early). RRA is about what can be enforced via a contract.
I’ll check and @David122 may know more but my understanding was RRA prohibited LLs from requiring more than 2 months notice (plus time to end on day before a rental period) basically ending fixed term tenancies of 6 months or 12 months etc. so they aren’t tied in even if their circumstances change (breakup etc). RRA doesn’t say you can’t have a shorter notice period in a tenancy agreement (which gives tenants more flexibility and ties them in even less). So clauses in an AST with a shorter period eg if a rolling 1 month tenancy already wouldn’t be invalid or void as they aren’t contrary to what RRA says, and would still apply.
The govt guidance says
“Your tenants will be able to give 2 months’ notice to end the tenancy at any point, unless you have agreed a shorter notice period”
So clearly you can agree a shorter period and that can be valid. I don’t see why agreement in the existing AST of 1 month notice (say) wouldn’t count as having agreed the notice in writing with the tenant, or why it would be overriden by RRA which only applies the default 2 months when there isn’t anything in the existing agreement ie “if the tenancy agreement does not say” below- the latter implies the tenancy agreement can say something lower - but @David122 may know more.
I guess it’s possible that because the clauses about 1 month notice were typically about break clauses or after a fixed term had ended they might be null and void because of that (ie because fixed terms are no more) so could be unclear. So def a good idea to get agreement post 1 may with tenants of what the new notice periods should be.
More of the guidance below.
If as LL you previously had tenants on rolling periodic 1 month and now tried to hold them to the 2 months they would point to existing AST as a signed written agreement setting out 1 month notice periods. Maybe it will happen and a judge will rule on what Parliament intended. For one month’s extra rent personally I wouldn’t chance it and would want to agree now with tenants what they and you expect re notice periods.
Best
If your tenant wants to leave
The tenancy agreement should say how much notice your tenants need to give before they can leave the property.
The maximum notice you can ask your tenant for is 2 months.
If the tenancy agreement does not say how much notice your tenant must give, they will need to give at least 2 months’ notice.
You can agree with your tenant to end the tenancy earlier or have a shorter notice period. This will need to be in writing.
Your tenant must give their notice:
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so the tenancy ends on a day when the rent is due or the day before the rent is due
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in writing, for example, by letter, email or text
You cannot tell your tenant how they should give their notice.
Your tenant will need to continue to pay rent during the notice period before the tenancy ends.
They can move out early without paying rent for the remainder of the tenancy if you agree to this.
If your tenant has given notice but changes their mind, they can only stay if you agree in writing.
If you do not agree, the tenancy will end as planned.