Metropolitan police patrol vehicle in London on an emergency call. © David Hoffman phone +44 (0)20 8981 5041, fax +44 (0)20 8980 2041, email lib@hoffmanphotos.com NUJ & BAPLA recommended terms & conditions apply. Moral rights asserted under Copyright Designs & Patents Act 1988. Full terms and conditions for digital and traditional use available on request. Credit is required. No part of this photo to be stored, reproduced, manipulated or transmitted by any means without permission.