After 20 years serving his country, royal engineer and paratrooper Mo Morris was given a medical discharge due to prolonged and continuous damage to his knees. He has been left struggling to walk unaided, and suffers near-constant pain. He is trapped in his home, which is totally unsuitable to his needs, but help is at hand - Nick Knowles and the DIY SOS team rally the troops of the local community and together they adapt the house, give Mo back his independence and take the pressure off the whole family.