Dunelm's Soft Snug Mattress Protector u sually costs £7 for a kingsize. However, it's been slashed in price as part of Dunelm's huge clearance sale, and is now a very purse-friendly £2.50.

The Zanussi Washable Electric Blanket Mattress Protector with Fitted Skirt comes in single, double, king and super king sizes. Prices range from £44 to £69.