Laura Harwin with 11 week old Sierra Harwin from Downham Market A self-confessed chocaholic from Downham is taking on a Dechox challenge to raise funds for a charity she has close connections with. New mum Laura Harwin, 30, is attempting to give up the sugary snack for the whole of March to raise money for the British Heart Foundation , after losing her own mother to a rare heart condition in 2010.