Some points I consider for my BC23, though I generally sail through the winter.
If you have cushions/soft furnishings in the cabin, take them indoors to somewhere dry and warmish, they soak up moisture and hence mould very easily, if that's not possible try and make use of a dehumidfier in the saloon.
If possible make sure you can get ventilation through the saloon and prop open hatches inside to let air circulate.
Make sure your ballast tank(s) are empty and as dry as you can get them to prevent any possible ice damage, leave the bung out. Same for interior domestic water tank. (Not sure if the BRe has one?).
Make sure cockpit and anchor locker drain, deck drain sumps are all clear of leaves and gunk so they drain freely. Check this regularly, else ice can form and cause damage.
Go over any exposed electrics and spray/wipe over with WD40 or similar - not forgetting the vhf aerial/wind/nav lights at the top of the mast if you have them.
Make sure the tension is taken off the centre board uphaul.. I can lower mine so it rests on a trailer roller. Same for the rudder.
Dig the anchor and chain out and give it a good clean off of mud and salt to fend off any possible corrosion to the galvanised bits.
Same for mooring lines/running rigging/sheets, wash them - if you can get away with it, stick them inside a pillow case and chuck the whole lot inside a washing machine. (Not the anchor/chain though, that generally doesn't go down well).
Disconnect, or better still remove any batteries and keep them on a float charge if you can, vaseline on the terminals.
Try and make sure you check her over as much as possible during the winter months...
Hope this helps..
