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The syndicate boats are used all year round apart from a maintenance period of 2 weeks each year, I had a share for 12 years and can't remember any problems, a lot of the owners cruise for a day or two and return to their own moorings for a night then venture out again, an electric hook up is pretty much a must but there are plenty available in the winter, so there is really no good reason not to hire if you get a suitable boat..
Depends how flexible you are, if you don't mind being stuck in one spot if the river/broad freezes then there is no problem because moving a boat through ice can cause significant damage to the gell coat. I have seen people cruising very slowly throwing the mud weight in front of the boat to break the ice but this is not entirely satisfactory and it is no fun as well as being some what dangerous. Of course cruising on a sharp crispy Winters day if the river is clear is a joy.
I think Steve51 made a good point in that you are fine if you keep the main rivers. The 'dead end's such as Ranworth, Sutton, Stalham etc may freeze if it's very cold but keeping on the main rivers particularly when mooring at night would seem to be the best approach to avoid any risk of being frozen in.