Freak winter weather and a dodgy sat nav combine to cause a terrifying accident on a snowy hillside that leaves a disabled woman trapped in her upturned car. The team race to save a plumber who has severed major blood vessels in an accident with an angle grinder and a biker is badly hurt, while a visit to a Yorkshire Dales beauty spot ends in a nasty fall for one holidaymaker and nearby, a shopkeeper is struck down by a suspected heart attack, just as bad weather threatens to ground the chopper.