The DNRC was formally gifted to the nation last year (Picture: PA).
A family who donated £50 million to the Defence and National Rehabilitation Centre (DNRC) has doubled its contribution to £105 million.
The Grosvenor family helped to launch the DNRC in 2010, with a donation of £50 million towards the £300 million total.
The Duke of Westminster, Hugh Grosvenor said: "My father had a vision to create a state-of-the-art rehabilitation facility, so those who suffer life-changing injuries could start their healing process knowing they were getting the best service that money could buy.
"His starting point was the armed forces, because being an Army Reservist had been part of his life for 40 years, but he was asked to extend his idea to civilians too which he did."
The Nottinghamshire facility was formally gifted to the nation by the Duke of Cambridge last year.
The services provided by the former rehabilitation centre at Headley Court, Surrey have been transferred to the DNRC site.
It is hoped a new multi-million-pound centre for NHS patients will also be given the green light to be built on the same site in the coming years.