Dixons Carphone Plc (LON:DC.) has confirmed Clare Pettitt will take up the role of interim group chief financial officer after Humphrey Singer announced he is stepping down to join Marks & Spencer Group PLC ( LON:MKS ). Pettitt, who has been at electrical goods retailer since 2013 and held the position of group financial controller, begins effective immediately. She will stand in until Jonny Mason, the finance chief at cycle shop Halfords PLC ( LON:HFD ), joins as the group chief financial officer at a date yet to be confirmed.