UK Property Law
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What type of contract are you on?
That isn't adequate notice I'm afraid.
Your AST might well say that you have to give two months notice although they might not get away with that.
Either way though, you have to give no less than one month's notice on or before the term date. The term is 25th of the month. Unless you gave notice before Christmas Day the notice you have given would not take effect until the 25 th January and would run until the 24th February.
However, whether he accepts notice or not, you cannot be forced to renew and he will have to accept it in the end.
Can I clarify anything for you?
No, but you could leave on the 24th February.
He could try to argue that notice should run until the 24 th March if the contract demands 2 months notice but he probably wouldn't get away with that.