Ok here is letter in full
Dear blah blah blah,
Your lease has now come to an end and by virtue of section5(2) of the housing act 1988 you are entitled to remain in possession on the same terms as are set out in your lease until such time as either LL or tenant give notice to the other
The LL is content for this to be the case and to avoid the necessity for a new lease and the cost therof
as the rent payable will be due for biennial review with effect from july 1 it is propose that it is increased by ( I wont give a figure but it is also going up by £50 per month}
it would be appreciated if you adjust your standing order accordingly thereafter
You are asked to give a minimum of three months notics in writing but noyt to be served so as to take effect in the winter months of Dec, Jan or Feb to bring the continuation of the lease to anend.
please confirm by signing the letter