In reply to dudders:
thanks for all the replies
I intend to go into the CAB to get their view on it. This isn't about me, but a friend.
Basically what happened is they moved into a property as a lodger after seeing an advert online. However the place was not as described in the advert and the landlord was a bit crazy. After three nights in the place they told the landlord that they intended to leave after one week, at which point he told them they had to leave that night, which they did.
They had not paid rent in advance or paid a deposit. The landlord is now demanding a full months rent, and threatens to take out a small claim against them. My friend has agreed only to pay for a week.
Seeing as no payment has been made, is there still a contract in place, demanding 28 days notice etc?
Post edited at 18:49