In reply to Hobgoblin:
When I lived in the IOM we had a member of the MFRCC that would fairly call himself a walker who asked the same question.
I suggested he try Glenmore lodge or PYB as they were what I knew of at the time.
He chose Glenmore and came back eyes gleaming after learning so much and having been encouraged to get up slopes he would have thought impossible before.
In the summer, we got him on his first real rock climb in the lakes, one of those routes by Ullswater used by outward bound and two days later he did Corvus with us, leading the top easy pitches as his confidence had increased so much.
He learned to use crampons and axes and snowhole and a bit of avalanche awareness.
If that is what you want contact one of the centres, or one of the BMG to see if they do the same thing.
You will come back knowing a lot more about the mountains in winter, in fact more than a lot of people who go regularly but never take a course.
http://www.bmg.org.uk/about.html