Ahh excellent I have been waiting for something like this!
McLaren.com have the feature for Lewis and Button, but not the whole driver line up. I would imagine that this will be an online feature mostly, and commented on briefly in the coverage.
For those of you that don't have an iPhone, there has also been an F1 app, with this very feature. The only thing is they charge you 20 quid for it. The official forumla1.com app doesn't have this feature only the live timings.
Here's me hoping that the beeb write a free app for it
It will be interesting how the beeb are getting the data. All the cars and team have military grade GPS, accurate to 0.5m most of the time, and updated at a high refresh rate.
Hopefully, the beeb have got the live feed, and so should be able to provide pretty accurate data!
Edit: Should really have read the article first as it mentions the iphone and everything. Oh well never mind