Four free Winter Lights festivals to enjoy across London

This winter, four free outdoor light displays will be held across London, as the idea of luring people out of their warm homes on winter evenings is becoming increasingly popular.
The Southbank and Canary Wharf have had winter lights festivals for many years. Then Battersea Power Station joined in a few years ago, and this year, so will Westfield shopping centre in Shepherds Bush.
Three are put on by shopping centres, trying to lure you into spending any left-over cash you might have after Chris