That Facebook link is now reporting that the police have banned the BNP march in Woolwich and have said it must take place in Whitehall. There's a link in the Facebook entry to a Met Police press release page giving a full explanation, but there's a request on the police page not to publish links to it so I won't. Although if you follow the link to Facebook you'll find it there.

Any idea why the BNP were intending to come to the Lewisham Islamic Centre? Is it the closest Islamic place to Woolwich?