Landlord Blues: Renting out the house from hell

On 5 October, Adrian went to see Peter to get the deposit repayment code he should have given us at least a month before. He was living in a large house not far from Hill View, that  Adrian said was a better house than ours! 
'What's more,' he added, 'he's paying the same rent he would have paid with us: £240 a month, including bills.' 
When  Adrian got to the house, despite having an arrangement to see him at 6 o’ clock he didn’t answer the door and  Adrian had to ring his mobile. He said he was worried in case it was  Jason, who comes around regularly asking if Peter can lend him money for a flagon of cider. Peter, himself, hadn’t drunk for eight weeks. 
‘Peter you'd better steer clear of him,' Adrian warned. 'He’s no good for you and might get you back on the drink.’ 
'Well, I'm off to Tenby fishing this weekend,' Peter said. He had made a new friend at a workshop where he was volunteering. 
‘That’s the kind of friend you need,’  Adrian said. It seemed that after his dreadful low-point, the only way was up; it certainly seemed like our evicting him had done him the world of good. 
'At least he's no longer in the same house as that alcoholic, Jason,' I said. 'And if he manages to keep stonewalling him, maybe  Jason will give up.'  
Adrian had reminded Peter: ‘Just remember his shouting and ranting when you had the blood pouring out of you, Peter. He is not your friend.’ 
On the other hand, the whole reason  Adrian had gone to see Peter was to get the repayment code so that we could get the deposit back and use it to repair a bit of the damage Peter did at the house and then he didn’t have the code! 
'I'll just have to keep on to him until I get it,' Adrian said, after his wasted journey.
Nothing much happened for a couple of weeks and it got to late October with Jason showing no signs of clearing off.
I decided to send him a text:
Me (17.08, 22nd October):
Adrian’s told me you’re not intending to leave next week, after having had two and a half months’ notice to get out. I think it is despicable and this will be yet another thing on your conscience. Every day you stay at the house we lose more money because we can’t let Peter’s room with you still there, because no-one would want to share with you, with the way you smash up the house and walk around exposing yourself. So, you’re going to wait for the court order and the bailiffs are you, after  Adrian and I have treated you so well over the years? You should be ashamed of yourself. You’re now going to put  Adrian and me through all this stress. Stop being so selfish and leave our house next week like any decent person would.
He had also not come up with the deposit repayment code and after Adrian reminded him again, he received the usual lies.
 Jason (13.34, 3rd November):
I sent it to u last week. I go get it again from my m.8s computer. Maybe I didn’t send it right. ill go have a look now
Jason’s notice had run out on 31st October and of course he had not left. He'd apparently been told by the local housing advice office that he should hang on till the bitter end, meaning a court order/possession order and the fees and lost rent on his room and Peter’s because we couldn’t re-let with that waster there. Paul, our electrician went up the first week of November to fix the shower. He said it had burnt out. While he was there he spotted a whole load of damage including cables that had been deliberately ripped out and which meant the electrical system wasn’t earthed and was therefore highly dangerous, so he fixed it immediately. He only spotted it because he happened to be there. Also, the fire alarm panel had been smashed in and other cables had been ripped out from the skirting board. 
Jason was causing us more and more expense while he stayed. We wondered if we could get the police over the latest damage, but assumed not. The last time they more-or-less said he could do what he liked in our house if he had a tenancy agreement. 
'If it was physical violence he was committing against a person it wouldn’t matter if it were done inside or outside a house,' I complained to Adrian. 'In the past, domestic violence was also treated less seriously than violence outside the home. But if it's damage, then where's the logic in it only counting if it's outside the home?'