I get back home quite late during the week so I tend not to go out again unless riding to some social engagement. At the weekend in the winter, I go to Richmond Park after dark when it's closed to cars, and when the cycling hordes have gone home. Mainly deer and badgers for company. It's wonderful. You can't get up to reckless speeds on the steepest hills for fear of impaling yourself on a pair of antlers, but that's not much of a sacrifice really.