I'd have posted this as a comment to https://www.indymedia.org.uk/en/2010/03/447891.html where there's a good video, but it's descended into usual tangential comment nonsense!
There was also the usual focus on the anti-fascists, and not the EDL who were allowed unchallenged to Zieg Heil, throw lighters, rape alarms and more at the UAF, and were able to have nice chats with friendly Bobbies. The police also did their usual, though perhaps more polished/pre-planned press releasing about the nasty violent antifa thugs. The EDL had also evolved their use of flags to try to counter their racist tag. There were a relatively large number arrested, especially as this was also pretty stage-managed with a peaceful crowd later reacting to snatch squad tactics.
Interestingly, there are some tactics and kit which appear new (though do say if you've seen them used before - how and where please).
It was all highly stage-managed. As people arrived in the square, there was an electronic sign that told you which way to go, depending on if you were UAF or EDL. You passed first through police lines and new 'cordon fencing' (puns based on cordon bleu and thin blue lines welcome!), then through gaps in Harris fencing also controlled by lines of police. Between the two crowds in the middle of the square was new deluxe crowd control barriers, with police, and dogs in between. So the whole square was sealed off at the outer edges with cordon fencing, high solid metal with small windows, plastic flaps at the bottom, and topped with anti-climb/cut fence panels. Then inside that were two Harris fencing enclosures for the two crowds, with gaps in also sealed by police, and the middle/facing sides of these enclosures was the lower new deluxe crowd control barriers.
All the roads leading off the square were either completely blocked by the new cordon fencing, or left a gap at one end, filled with police; there was one street that was not blocked at all, except by cops on horses.
Hopefully the pictures are useful.
It would only be conjecture to try to figure out if these public order tactics are local (ie they haven't taken on board the G20 lessons like the Met police have), they are specific to anti-fascist mobilisations & nationally decided, or if they are a national evolution post-G20 to public order situations.
More info on public order situations and how to deal with them at