MADRID (Reuters) - Santander has taken a £350 million majority stake in UK-based Ebury as part of a digital strategy to boost growth through new ventures, the Spanish bank announced on Monday.Ebury is a trade and foreign exchange facilitator for small and medium-sized companies which operates in 19 countries and 140 currencies, Santander said in a statement. Santander said it is acquiring 50.1% of Ebury for £350 million, of which £70 million will be new primary equity to support Ebury's..