When Doug and Sandra Douglas were in their mid-forties, they became first-time parents - to twins - and were overjoyed when their baby daughter and son arrived. But by the time little George and Nicole had started school, incessant tantrums, biting, swearing and kicking from both twins was driving their parents to despair. Supernanny Jo Frost took the twins in hand and turned their behaviour around. Two years on, she's back in Staines to see whether the family have stuck with her training.