Thanks for all the replies. As I said in the op it's partly the weather and partly other issues that have made the general feeling of ennui that I normally experience in winter, but which hasn't stopped me cycling or going for long walks in other winters, much worse than normal.
The vicious cycle has not been easy to break out of, but I am determined to get out on the bike more often the rest of the winter, although I suppose that I have to get my priorities right and eventually the cycling, which is a bit lower down the pecking order, will sort itself out.
P.s. I quite successfully used a light box for a couple of winters, but following two ops for torn retinas and a condition called epiretinal membrane in one eye the optician recommended that it was no longer a good idea. I don't want to mess with my eyesight.
Last edited by Gerryattrick; 01-31-16 at 01:29 PM.