Sally I think also the police advice is that we'll have to stop at traffic lights even at the cost of breaking up the ride, so we'll have a chance to show how disciplined and nice we can be.
The only way to avoid that is to get a police bike or motorbike escort....
I'm happy to assist at junctions - had to do that on rides before. You will get some people though that will just ignore signals as they already do on their daily commute. We had parents do that on the changingpace rides we used to do. These were not 'radical' but people who think it's ok to make up rules as they go along. On school rides we had escort riders who would stay at a junction and actively block people going out till it was safe and legal.
But... if you have a procession of 1000 bikes expect about 200 of them to ignore lights (based on the 1 in 5 rule I and others see on our daily commutes).
Crowriver If there are over a thousand, the procession will take up the length of MMW and fill up most roads it proceeds down. Then I'd say marshals and temporary suspension of traffic signal observation would be safer and less disruptive to motorists, pedestrians, etc.
Yes - agree. Cycling infrastructure can't cope with mass cycling and based on around 4% of road users use.