Brooks arrested. I'm surprised this isn't bigger news. Only a small mention in my paper, and I had to dig around to get this on the beeb.
http://www.bbc.co.uk/news/uk-14178051
It was bigger news the other day, but has been superceded by Stephenson resigning.
A resignation is more significant than an arrest (although arrests sound more dramatic). An arrest only signifies that someone is under suspicion. The big one is if they are charged which means there is actually a case for them to answer (and bigger still if they are then subsequently convicted).
Cameron should be able to ride this out. He hasn't done anything improper. It's purely guilt by association at this stage, something that the Labour partisans now complaining about this were just as guilty of.