Lots of washing and waxing (no-abrasive polymer based wax only) and keep everything lubed as you will need to with allthe washing and bad weather. Might also want to get a battery tender to keep 'er charged fully. Good luck. I ride mine all year as well but I try to stay out of the really nasty weather. Here in the states salt is widely used on roads in the winter and is hell on a bike ro car so you must keep it clean. Be sure to rinse well under the bike and in every little nook and cranny to get the salt off of it (if they use it in jolly old England).
A tip on winter washing (even below freezing), I use two buckets, one with hot soapy water, one with hot, clean rinsing water, and a large stadium cup to poor the rinsing water over the bike. That way you don't have to pull out the hose just to drain it and store it away after you are done with it (otherwise the hose will freeze solid and/or burst your outdoor spiget). Great way to keep your bike (or car for that matter) clean all year.
Everyone will wonder how you are washing your bike when it is below freezing. Oh, if it is well below freezing you must dry off the bike quickly or else you will have ice (hard to remove).
