In answer to your question on how to catch Sea Bream from a wreck in the Channel.
I, like your self, spend most of my boat fishing outings in mid channel. The method I use, and which I find very productive, may differ from other methods used by other anglers, however here goes.
My favourite rod is a 12 - 30 Diawa TDXB coupled with an Abu 7500 C3 reel. The line is Berkley 65lb whiplash with a 40lb clear Drennan Greased Weasel leader. This is connected to a zip slider with the clip removed followed by a bead and a Gemini Swivel n Link. With a set up as this I can change my fishing methods quickly and efficiently without wasting time.
The reason I use 65lb Whiplash is that if a get snagged up, I can normally pull my braid clear using a gloved hand. You might want to use a lighter braid, however the choice is entirely yours.
I use 2 methods depending on conditions, I either ledger or use a running paternoster. When ledgering, my trace is about 2ft 6ins long of 30lb clear Amnesia, I attach a swivel to one end, 6ins from the swivel, a snood of 12in. 20lb Amnesia attached to a size 1/0 hook (no bigger). Then another snood, the same as the first one 6ins up from the bottom. My weight is attached to the bottom, once again using a link clip; this enables me to change weights as and when required.
When I use a paternoster, I re-attach the clip to the zip slider, attach my weight to this and a 4ft length of 30lb Amnesia using once again a swivel at one end and a 1/0 hook at the other. On occasions I attach a 1ft. long snood to the trace about 1ft from the swivel.
My bait is normally 2in. long thin strips of Squid passed through the hook twice, sometimes tipped off with a small piece of Mackerel. This is all down to trial and error. After all, this is what fishing is all about! Trying different methods to outwit the fish.
No matter what method I use, when I detect a bite, I always lift and lower my rod quite a few times whilst at the same time slowly winding in my reel. In my little mind I just hope that the fish will think that it might just loose an easy morsel and take a large bite. These methods work for me, I have no doubt that other members of the Forum will have different ways and means of catching Bream and that they will inform you of them in due course.
If I was only targeting Black Bream and nothing else, I would use a lighter rod and reduce my other tackle accordingly. However my Diawa has done every job asked of it and more. Black Bream are a lovely fish to catch and in my opinion, using the lightest of tackle gives a battle beyond all others.