Shares of Mothercare rallied 4% after it confirmed the appointment of Simon Calver as its new chief executive officer.Calver, 47, will join the Mothercare board as CEO on 30 April 2012 at which time Alan Parker will resume his role as non-executive chairman, the group confirmed in a company statement. Calver joins Mothercare from his role as chief executive of LOVEFiLM International, part of Amazon.Commenting on the appointment, chairman Alan Parker said, "Simon Calver is a highly successful business leader with experience heading multinational consumer facing organisations.""His e-commerce and brand expertise will enable Mothercare to accelerate its development as a multi-channel retailer in the UK and his international perspective will be invaluable to the continued rapid expansion of Mothercare and Early Learning Centre globally."