I posted the output from our reporting system to the BBC Backstage mailing list which Martin Belam has conveniently summarised on his blog.

There is some difference between Journalism and the rest of the BBC which may be explained, as Martin suggests, by the different usage patterns for the News site, although I don't know whether all the differences are statistically significant or could be explained by sampling error. (Compared to the rest of the BBC, more people visit the News site from an office computer, during the day. We have data from independent sources which confirms this).

All of the BBC's regular reporting mechanisms use the User Agent string to make inferences about the client operating system. In a follow-up post I should be able to give you information about how many User Agent strings are classified as "operating system unknown", and about the split between visitors from the UK and from outside the UK.

We will publish this data regularly on both the Backstage archive and this blog.

Kevin Hinde is Head of Software Development, Journalism, BBC Future Media & Technology.