Anyone from any part of London or anywhere else can register objections or comments.
There are certain reasons for objections that are taken into account eg. size/style of the building, congestion, inappropriateness for area, overcrowding, loss of land use for housing, public facilities/open land, loss of daylight/sunlight/privacy, noise nuisance, parking issues etc. Other possible issues could be: potential disruption to area with policing/security, possible cost for extra policing. Certain reasons are not taken into account eg. loss of value of property, noise and disruption from building work. Objections or comments can be made directly through the planning application on the Camden Council website: http://planningrecords.camden.gov.uk/Northgate/PlanningExplorer17/PLComments.aspx?pk=246856 - or sent by letter to c/o N. McDonald, Customer Support Team, Planning and Public Protection, 5th Floor, Camden Council Town Hall Extension, Argyle Street, London, WC1H 8EQ. Emails and letters need the sender's postal address, planning application reference number (2010/4721/P) and site address (Site to the rear of the British Library, Brill Place, London, NW1 2DB).