Living with a Crystal Meth dealer

So I am over in the UK doing a placement for two months. I am staying in student accomodation. There are only 2 of us living in the flat. The other guys name is James. He had a party last night and I happened to be going to the kitchen for a cup of tea. ( I know. Hardcore.)

As I was passing the jacks, three lads came out at the same time. A bit odd but you know how metrosexual english boys are. Anyway, around 3AM, I am woken by the housemate screaming at somebody. I hear scuffles and go out the door and see the two laying into eachother. I am like "What the **** is going on here?" The other lad started screaming that James has ruined his life with meth. Lad was in tears. I told them to **** off as I had to work and they promptly went outside. Around 7AM, I hear somebody knocking on my window. It's James having locked himself out of the apartment.

I go to let him in. He was tweaking like mad telling me that people had followed him from the shop and that his dealer had threatened him with a gun earlier. He had bought 12 packets of ham and a red lightbulb. He then proceeded to tell me his life story, about how he got into dealing and how far he had sunk.( He'd sold crack and meth to pregnant women.) Also, he owed his dealer a fair bit of wedge. ( couple of thousand) Said he wanted to get out but the big dealer was threatening him if he tried to get out.

Anyway, he ****es on for about 20 mins about how he is scum and I looked for an opportunity to **** off back to the bedroom to get changed for wor. Eventually, he says he is going for a walk. He comes back 10 mins later with somebody and as I am walking out, I see these two older knackers carrying out the widescreen tv from his room. These lads looked rough, full of tattoos and just stared at me as I was walking out the door. I was talking to James there a couple of mins ago and he is in bits saying that they are making him carry the drugs between different locations in the city.

The thing is that James is a normal enough guy. A bit metro but goes to uni, from a decent middle class background and his life is FUBAR. He claimed to me that he hasn't tweaked in a month or two but obviously he was off his rocker last night. He told me he has been up since midday yesterday. He had also eaten 6 packets of ham.

So what am I to do? I don't think I want to rat him out as his life is ****ed up enough. I really don't want knackers and meth heads hanging around the apartment either though. Is meth that big in UK/Ireland? I had always associated it more with the US. **** has gone all Corner-esque.