I hope you can help..

I have lived in a shared flat with 3 others, including a chap who co-owns the property with his uncle. He has never sorted out a written tenancy agreement although we have asked him to do so. He is very anti social and will often not talk to us for no reason and puts his television on very loudly at night, which disturbs our sleep. He wanted us to all to contribute to a hoover that we had asked him to buy when we first moved in. He has had a party and invited his friends without asking us first, told us that he would need to use our bedrooms for them to sleep in. 2 of us refused and left the property for the weekend as he made it quite clear that the party would go on regardless of whether we wanted it to or not. There was some damage caused at the party and he has said that he will take money out of our deposits for it although we were not there.

We have finally had enough and have handed in notice. Although he claims otherwise, there was never any....
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verbal agreement with him about the length of tenancy or notice period. (In retrospect i don;t know what i was thinking there, but hey ho). He changed the rental dates and demanded more money for the first month than he had first requested in the ad and prior to me moving in. As a compromise, he said that he would use the deposit as a months rent and has now said that he didn't do that, and that i owe him rent. He apparently still has the deposit 'somewhere'. I am now moving out in the next 2 weeks after he has had 3 weeks notice and he is becoming more and more volatile. Last night he refused my rent in cheque form (which is how i have always paid it) and demanded that i give him cash. I have refused and have put money into his bank account as his attitude at the moment is that there is no proof of us being his tenants. He has threatened that tonight if the money has not cleared in his account then he will change the locks on the front door and bedroom doors. Is he allowed to do this?