Scotland sees a boom in skiing as the big freeze continues. Photograph: Murdo MacLeod/guardian.co.ukLooking out over the Ptarmigan station on Cairngorm Photograph: Murdo MacLeod/guardian.co.ukOutside the Ptarmigan station at the top of the funicular railway on CairngormPhotograph: Murdo MacLeod/guardian.co.ukLooking out over the Ptarmigan station on Cairngorm Photograph: Murdo MacLeod/guardian.co.ukSnow boarders at the summit of Cairngorm MountainPhotograph: Murdo MacLeod/guardian.co.ukA snow boarder at the summit of Cairngorm Mountain. Photograph: Murdo MacLeod/guardian.co.ukSnowboarding in Northumberland.Photograph: James Cummings/guardian.co.ukTow rope in Weardale, NorthumberlandPhotograph: James Cummings/guardian.co.ukYad Moss, CumbriaPhotograph: Phil Tinning/guardian.co.ukYad Moss, CumbriaPhotograph: Phil Tinning/guardian.co.ukYad Moss, CumbriaPhotograph: Phil Tinning/guardian.co.ukYad Moss, CumbriaPhotograph: Phil Tinning/guardian.co.ukYad Moss, CumbriaPhotograph: Phil Tinning/guardian.co.ukYad Moss, CumbriaPhotograph: Phil Tinning/guardian.co.ukGlencoe ski centre, ScotlandPhotograph: guardian.co.ukGlencoe Ski CentrePhotograph: guardian.co.uk