If ya going for that big cod or ling on the english coast then heres a tip ....
Get a good sized mackrel and cut it from just under the gills to about 3/4 down its body. Take out the insides and fill it with SQUID , MUSSEL , and RAZOR.
Now wind some elastic around the fish to make sure all your work wont fall out.
Hook on and watch the fish go mad for the cocktail of bait and scents for the fish to enjoy.
Hope this works for you