Yes, this week we have a seasonal Undercover Soundtrack – and one that examines the imaginative lengths a writer has to go to. When you hunker down to read a Noelish tale on a snuggly sofa with snow at the windows and a fire crackling in the grate, spare a thought for the writer, who was probably in flip-flops and T-shirt, shutting the curtains against the sun blazing on her laptop screen. Such was the lot of this week’s guest, who began writing her Christmas collection of off-beat romance stories in July. She says she relied heavily on music to create the mood – and risked husbandly disapproval (though he didn’t mind the unseasonable baked goods that were also necessary). So are we about to drag you through the infuriating radio canon of Slade, Mariah and Bing? No, let me reassure you this Soundtrack is a dignified collection, with Katherine Jenkins and Sarah Brightman. Mostly. Drop by on Wednesday to meet Jan Ruth and her Undercover Soundtrack for summoning Christmas in July.