grew up fishing nanpanton res! what a hole!
anyway it is what it is, if thaings havent changed too much in the last 25 years.....
in the middle of winter id head for one of two areas.
1- the fence at the far end. drop one as close to the outlet as you can and one in line with it about 5yards out.
2- tower. from left hand side of the tower cast about 10-15y behind it other rod bang out just short of half way.
no idea on bait! been too long.
i take the micky of the plae but its where i cut my carp fishing teeth there as a 15 year old.... aaarrrrggghhh 22 years ago!
enjoy it and dont think too hard.