In the dark days of winter we need a little light to make us smile in the gloom. It is dark in the morning, it is dark as you leave court, you never see the house in daylight from Sunday to Saturday – if you are busy over lunch you will never even be outside in the daylight, or only rarely. Indeed, for those stuck in offices watching the sun set at four o'clock and internally howling at the moon at the prospect of another three hours at least at work, in the dark, where do we turn for some light relief?