The meetings in Trafalgar Square are great for uniting people and focusing their attentions but to my mind Trafalgar square is absolutely the wrong place to be holding them.
Let me explain.
I think that the powers that be (BJ and his lot) could not care less about the protests. I would bet that if asked, they wouldn't have the first idea what any of the speakers were talking about. Thats the job of the state security (Stazi) The Square is a perfect place for THEM to allow a demonstration. They herd the people into this large area, pretty much walled in and without many exits. The police are finding it easy to control things, even to mount 'practice' baton charges, they have a captive audience. If this was a military campaign, Trafalgar Square would be one of the better places to drive the enemy into for the reasons above.The police can cover ALL exits quite easily and can control what happens inside.
In short, the government does not have to worry about the protest.
This kills the whole point of the demonstration entirely - So what if a few people want to scream and shout, they cannot do much more than that and we can stop it at any time we want.
The demonstrations should be held in a wider, open environment, there are places, Hyde Park, Parliament square (not quite so good but a powerful psychological area being the seat of government) etc where the Authorities cannot contain or control the protesters quite so easily.
The demonstrations are not achieving a thing. After each demo, the government hand out stiffer regulations, almost like a snub to the people and to re-enforce their power. Believe me, we can shout and scream about how they do not have power but when a group of guys are holding you down with batons etc, it is they who have the power over you! especially if you have nowhere to run.
By holding these demonstrations in a more open area, the authorities will have to earn their money in keeping control. Or in other words, they will be highly inconvenienced and this will have much more impact than the Trafalgar square demos. The authorities will have to commit more resources to the demo, forcing the powers that be to start taking notice. The IRA were masters of creating pandemonium without actually doing very much, just the threat of what it could have done.