Countrywide announced six new senior appointments and a shake-up of its structure on Friday, which involves bringing its core Estate Agency and Lettings divisions into one retail structure.The company appointed Samantha Tyrer as managing director of Retail. Tyrer joins Countrywide from Dixons Carphone, where she was responsible for 8,500 people across 1,100 branches.Paul Creffield, who has nearly 20 years' industry experience, will be managing director of Business to Business, while Graham Bell has been appointed as managing director of London, having led the company's recent 'Building our Future' programme.Peter Curran will be managing director of Financial Services, having joined the company this year from Lloyds Banking Group.Kate Brown, who joined from Bupa in March this year, has been appointed group HR director, while Andrew Pennells will be group transformation & change director. Pennells was formerly sales director with Contrywide's Estate Agency division.At 1226 BST, shares in the company were down 1.3% at 562.50p.