The odd one or two does pop up during the winter but i think it`s more the execption than the norm.It may be worth fishing a kebab type set up with a big old single hook and tracefor pike and keep your fingers crossed a big old cat might decide to feed....you just never know!!!
I know of a section of the nene close to where i live that threw up a 25lbs cata month or so ago and i know some good 20`s (pike) have also come out from the area,so i may just give it a try???