That's the famous GillSans. Commercial. But widely available on the web.
Mea culpa! That was a bit too quick. Sorry. This is not the Gill. On first sight it looks a lot like it but in reality it is very different, 'e' and 'b'. I'll keep looking.
I was gonna say I'm sure its not (I wouldn't be that lucky!)
I hope someone knows what it is! :(
If anyone is interested its 'The Sans Office' if not the Office version certainaly TheSans family, by LucasFonts.
Any ideas? :/