Interesting to hear some opinions on this, as I'm definitely in the same boat.
It occurred to me that its actually more important now that day/sunlight is in such short supply, to try and get outside. Otherwise I can very easily spend days and days holed up inside, never seeing the light of day!
I have tried to make it a habit to get out early to meet a mate for casual spin, followed by coffee. The coffee at the end of it makes it very slightly easier to get up/out in the dark and cold! I think having the commitment of knowing somebody is waiting for you to meet is a good way of actually getting it done. Once you're out, its very rarely regretted - just getting out that is tough.
I definitely echo people's views on riding around London though - I have moved a bit further out in the last year but finding it very difficult to get out anywhere other than RP in the mornings, due to the CRAZY amount of traffic at the moment. Even the park is just disgustingly choc-full of traffic. Any ideas for routes doable in a morning around Surbiton way are welcomed..