Holidaymakers were unable to revive the little girl (Picture: SolarPix) The parents of a toddler who drowned in a Lanzarote swimming pool were seen desperately searching for her. The girl, aged 4, vanished before being found in the main pool at HL Playa Blanca resort in Lanzarote on Saturday. It was the latest in a spate of child drownings across Spain, which has sparked a warning for parents to supervise their children when near water. Holidaym…