Kacey Louisa Barnfield (born 14 January 1988) is an English actress. As a teenager she was best known for her role as Maddie Gilks in the popular, long running TV series Grange Hill.She spent a total of 6 years on the show. As a young adult, her most notable roles include Crystal in Resident Evil: Afterlife. And also Katie Sutherland, otherwise referred to as ‘Neil’s sister” in award winning British comedy The Inbetweeners.