The reason why
A former NHS IT manager says
"It seems to me that in the long term more aggregation of data rather than less would make the NHS more efficient"
This is why NHS IT is so terminally ill - because it keeps employing people like David Harley with no imagination and an attachment to dogma that would make a jesuit wince.
Collecting and analysing the right data is important.
Collecting and analysing more data as a blanket policy is not just expensive it is positively dangerous because
a) it tends to make people think they know something that they don't
b) useful knowledge tends to get lost and distorted in a mass of meaningless stats
c) it undermines the confidence of people who are actually qualified to make decisions by second guessing them with ill-informed speculation
And bear in mind that anecdotal information from the right people is of more value than these mass collections of data.
Never let anyone with IT in their job title near an information/data policy.