Siobhan Hayes (born 23 April 1975) is an actress, best known for her character "Sandy", the office trainee in the BBC Radio series Absolute Power.Hayes also starred as Abi Harper in the British television series My Family. Hayes portrayed Abi Harper, as an dimwitted and clumsy student in the British sitcom My Family, a role she held between 2002 and 2008, when the character became a nun, allowing a potential return.