"We have tailored commercially available software, but we're pushing the edges of realism and scale, " he told the BBC.

BBC: British army stages record-breaking virtual battle

We've created the work programme so we have tailored support for people and now we're looking at these recommendations which say that if we get some early intervention for people when they first have health problems then we can really help people not fall out of the market in the first place.

BBC: GPs 'should not write sick-notes'