When I got there the signs were already up: 'Paternoster Square is private land. Any licence to the public to enter or cross this land is revoked forthwith. There is no implied or express permission to enter any premises or any part. Any such entry will constitute a trespass.' Bundles of legal papers were duct-taped to the archways leading into the square. Police stood about, watching. A few tourists drifted in and out. Photographers stood by, crash helmets dangling from their waists.


