8ball
Decolonise colons!
I think it's naive to think that the police's fear of bad publicity (in the light of the widely reported US police brutality) will give them pause for thought instead of attacking the Occupy London protests when they get an opportunity. It will be messy but they don't care.
So do you think they are chomping at the bit for an opportunity?
Like I said before, I think the rank and file would mostly do what they were told (many with a great deal of enthusiasm), with the odd dissenter here and there.
I think there are senior officers in the Met who wouldn't want anything to do with a brutal crackdown - the Met has different internal 'voices' (you hear these chirping up occasionally whenever the Government wants to bring in some ropey authoritarian nonsense, the 'marching people to cashpoints to pay spot fines' being one example that springs to mind). Various corporate interests close to Government wouldn't want to be associated with a likely resultant public outcry either.
If they went down the route of unjustifiable violence in full view of the media I think it wouldn't be long before it became clear to everyone what the lie of the land is in our 'democracy'. So I think for the foreseeable future (until something 'gamechanging' occurs), it will (in this country at least) be a patchwork of toleration, dispersal by manhandling, and the odd case of 'overenthusiastic use of force' (because you can't rein them all in all the time). Where proper violence is used I think they will be careful to handle the fallout, which given their incompetence in managing these things will mean keeping it out of the way and behind closed doors where possible (hence likely increased use of 'snatch squads').
That said, I think if these protests were taken to be a meaningful threat to the current state of affairs, the protesters would be met with armoured bulldozers and flamethrowers rather than batons. The protesters are just seen as a minor nuisance with little public backing at the moment.