Tenancy ends in a week and not heard anything from landlord/estate agent?

Hi all,

I am about to come to the end of my 12 month tenancy and 2 months ago the estate agent enquired if I wished to sign another one. The landlord said they would like a small increase in the rent and I counter offered suggesting that the rent remain the same. Since then I have heard nothing. I have contacted the estate agent and they said that they have chased the landlord up but have heard nothing.

What happens on the day my tenancy expires, do I have to move out? also, what happens if the landlord comes back in the last few days and says he insists on a rent increase?

Thanks in advance,
P