Part-nationalised bank Royal Bank of Scotland is beefing up its board with the appointment of two non-executive directors.Aviva group finance director Philip Scott will join the board from 1 November and will assume the position of chairman of a new Risk Committee of the RBS board. Penny Hughes will join on the first day of 2010 and will assume the chairmanship of the board's remuneration committee.'Philip Scott has wide-ranging experience of financial services and risk management, including previous responsibility for Aviva's continental European and international life and long-term savings businesses,' said RBS chairman Philip Hampton.'Penny Hughes has extensive boardroom experience, having held a number of non-executive positions following her executive career at Coca-Cola, including as a member of the board of Skandinaviska Enskilda Banken since 2000,' Hampton added.