With England in the grip of a rare heatwave - clear blue skies, late 20s to early 30s C temperatures, high humidity - Nissan Motor, which has an assembly plant in this country, claims UV protection on its crossovers such as the Qashqai and Juke (produced in Sunderland and sold across Europe) plus the imported X-Trail is equivalent to a Brit slapping on sunscreen with a sun protection factor (SPF) of 500.