Holy Island is a magical place, rich with nature and history – and best enjoyed when the tide comes in, writes Helen Wilson-Beevers Sign up to Simon Calder’s free travel email for expert advice and money-saving discounts Get Simon Calder’s Travel email Get Simon Calder’s Travel email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice T here’s a tidal island in Northumberland where every year 10-20 vehicles become stranded,