Hello, you're probably not on the best forum to get a lot of replies mate. Most of the lads on here are concentrated in the North East of England......however there's a lot of knowledge on here and I'm sure that people will help you if they can.
As far as my experience goes in Lincolnshire you have the famous smoothound and ray marks at Chapel St. Leonard's and Mogs Eye but I have no knowledge of those marks in the winter months.
I have fished a couple of the beaches in Norfolk, Pakefield and Kessingland. We had some nice cod and also sole. The beaches along Norfolk were once famous for the quality of the cod fishing, Aldeburgh in particular. This area was famous too for the guys who backcast.
Good Luck, Ian