Does anyone have any experience of touring during the winter season?
Did a sub-zero tour early this year in France with my son. The main thing you need is plenty of layers - it's easy to overheat when riding, then chill when you stop. I carried a down jacket on the top of the rear rack - whenever I stopped I put it on (along with a hat). It also makes a handy extra layer over a sleeping bag. I ended up sleeping wearing a fleece base layer inside my sleeping bag.
Typically my winter layers are Helly-Hansen fleece leggings with Ron Hill tracksters on top, Helly base layer shirt, fleece jersey then a pertex windproof. Waterproof jacket and overtrousers are essential as it's easy to get soaked and hard to dry out. Pack them on top!
Most other camping things are the same - a tent with a decent size porch for cooking is a must - it acts as a windshield and rain shelter. I prefer a fast powerful liquid fuel cooker like a Coleman or MSR so hot food and drinks can be prepared pronto. Gaz is OK provided you have a good solution for wind protection, but can be poor when very cold.
Of course the winter is often quieter in hotels so they are cheaper and generally available, which is a big help if you don't fancy camping and want to travel lighter. A Travel Lodge might not be the last word in exotica but can be a cheap overnight stop.
Ride it or milk it!