Mr. Chris Macey:

There is a national stroke audit, which is how we know 6,000 stroke cases go into hospital every year, for example. There is also a heart attack audit, but there is no register in respect of, for example, heart failure, as we have said. Some of it is estimates from experts and some of it is from research we have carried out ourselves, as well as international studies, extrapolations of that and so on.