Handing GPs control of the health budget and commissioning of hospital services would be "disastrous", a medical charity has warned.

Health Secretary Andrew Lansley believes family doctors are best placed to understand patients' needs and wants them to decide where money is spent.

But a Muscular Dystrophy Campaign study seen by Newsnight found many GPs had no knowledge of muscle-wasting conditions.

Sophie Hutchinson meets the Field family, whose 12-year-old son has the condition.

Broadcast on Tuesday 25 August 2010.