Updating post from Reddit.
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You don't need a confirmation letter from the tenant , if you have an email exchange where they understand the situation, it should be fine, you can just continue as is.
You don’t need to do anything at all it’s already covered in the AST that after the fixed period it will move to periodic
Yep, I just sent an email to my tenants explained as the per the contract it would fall into a periodic tenancy , and as long as they continued to pay rent , the notice the period for them to end the tenancy would be " x "
It's all automatic; you now have a "Contractual Periodic Tenancy" if you want to Google it. You dont need a new tenancy in October, can continue like this forever.
However, it is useful to get new tenancies signed as 3rd parties always request them.
You don’t need to do anything as it will revert to a periodic tenancy. So save on the admin.