Protest about the "right of protest"

Just spotted the following Pledge Bank pledge being promoted on Boris Johnson's blog.

It's a pledge to be involved in a prtest about the Westminster no-protest zone by forming a human chain around the edge of the zone. This will mean the protest is 100% legal and won't require prior permission. The closing date for the pledge is January 2007, and they need 6000 signatures. You can sign up now, here.