Lacey and her husband Paul Harrison have a son, Charlie, born in November 2002, and a daughter, Betsy, born in November 2005. She has also appeared supporting the One campaign founded by Actress Claire Goose's brother Duncan, selling bottled water in order to fund projects to provide clean drinking water around the world particularly in Africa. The campaign advert featured Lacey, Claire Goose, David Tennant, Hugo Speer and Ian Kelsey. She has also provided a number of TV advertising voiceovers.