You can buy a tow-bag / bouy / float thing for about £15, it's a safety thing mainly you've probably seen people with them. They have a waterproof pouch inside for keys and that. I've got one it's spot on. You get a belt and that with it.
The ice-guys aren't really for swimming as such, it's more cold water therapy i.e just in your skimpies having a slow breathing session and a 10 minute dip. It's great for recovery and mental health etc..
There's a cross over I think between some of them and the fausto/Roker swimming club which are the ones that actaully swim out to the pier and stuff.
For that your looking at wet suit, goggles, swim cap, and tow-bag as a minimum (somoene might correct me on that). The wet suit isn't just for warmth but also helps with bouyancy .
I've been out a couple of times during the summer in my own , got a wet suit off gumtree for £20 and went for it. Just go in off Roker beach inside the piers and it's relatively safe. I just went about 30m out and then swam left to right parallel with the beach. Probably could touch the floor . The weather/wind/current/swell makes a massive difference, so I only went alone when it was like a mill pond , but there's always others there swimming about.
You can get neoprene booties and gloves and stuff which would certainly help at this time of year. I don't think there's much you can do to prepare for the cold. It's Baltic
Thanks mate that's really brilliant information, greatly appreciated. Yes I've seen the bouy things, didn't occur to me they'd double as a key store type thing too, excellent. The ice guys activity actually sounds exactly what I'd be interested in, getting down to hypothermia body temperature and controlled breathing etc. I've had a look at the open swimming society website too but must revisit as it has so many different sections about survival, water temperatures, warming up safely and a whole lot more.
Think I will do a bit more reading then maybe contact the ice guys social media. I've been thinking about this for a long time and then there was a piece on country file about it tonight.