don't know, but there's a fair few possibilities.
could be a plant, could be some of the stuff I mention above, info picked up / overheard at the climate camp kettle, or could be that the police had simply added themselves to a relatively open email list and received enough details via email to piece it together, or a combination of some or all of the above.
the presence of 3 forces IMO doesn't actually necessarily indicate much advance notice of the operation, as it could also be a sign that the operation was pulled together using the Mutual Aid system to request urgent support from surrounding forces, though I think it's more likely they had advance intelligence.
Read my other post on this, but i feel there is a Police Informer within see http://autonomousnott.wordpress.com/ for a good update and links to past actions involving said alleged Police Informer,.
An action at an opencast went ahead no Police there, when we met in the dead of night at a community center, only those who needed to know had the information of where we was going to hit, 5am wake up we are all given a note telling us where said location was and the aim of the action, we was asked to rid ourselves of the note..
We move off, aksed to keep mobiles switched off etc, get to the location of Dolehill at Wingerworth, Chesterfield the place was taken out of service shall we say, it was then talked about going to occupy the office of RGB, of which we did some hours latter we are all nicked for the theft of a yoghurt, ie burgulary.
We are all detained and interviewed, not one of us talks apart from one person, we are all then charged and a court case of several months ensues, following this some of no longer was involved..
However the person who talked, is still active, and each time a Mass Action has been planned with them involved it has been nicked, further prove of what i call speculation, is during The G8 Ministers Meetings in Sheffield, The Police had a good idea of our plans, none was talked about on email or phones, but only in closed meetings of which alleged police infromer was there, and when the convergance space become a social center they become involved.
You might ask why did i continue to be involved, because i was told by trusted people what i thought was not fact, so move along, now following the nicking of 114 people i raise it again as a posibilty not an absolute, but it needs to be asked
In the meantime, we will need to keep a look out for the fallout of these arrests and support anyone who is charged. The cops have certainly not beaten climate change movement but we do need to rethink how we organise and act.http://autonomousnott.wordpress.com/