In reply to Tombin64:
There are many roads to Rome... or becoming a winter climber. (I'm an independent provider of courses but also work for Glenmore Lodge during some of the winter- I was also a self taught winter climber). Its perfectly possible to become a sound recreational climber without ever going on a course; learn from friends, club members etc. Go out with a variety of winter climbers making sure they are happy to share their experience rather than just use you as a portable belayer.
A course is also not a bad place to start providing the Instructor builds your experience throughout. So early on they may be explaining their decisions and later, if you are out with them over a sufficient period of time, you may well end up being the one making the decisions with a little guidance. But you can't do all of your climbing on courses.
So in practise a combination of both also works well. You will want to build on current experience (any of: summer hillwalking and roped scrambling, summer climbing, winter hillwalking). A course as a primer or a checkup is a useful starting point early on but then you have to go and get some independent mileage at a suitable level and with peers- both equally and more experienced would be nice. Another course for some next steps later on may be useful for shaping your skills, explaining some of the common habits you've observed and picked up and give you the confidence to go on and continue developing. Have fun. Scottish winter climbing is like nothing else- frustrating, painful, terrifying, adventurous, exhilarating and rewarding (often on the same day!).