Britain's next PM May stakes claim to centre ground

By Kylie MacLellan BIRMINGHAM, England (Reuters) - Britain's next prime minister, Theresa May, pledged on Monday to put government at the service of "ordinary working people", laying claim to the centre ground in an effort to heal rifts exposed by a referendum vote to leave the European Union. May, 59, who could be appointed prime minister within hours after her rival Andrea Leadsom quit the Conservative party leadership race, moved quickly to ease concerns that she would not deliver on Brexit a