Permission to Shoot on Premises

The opening shot will be shot on a council estate on the weekend outside of school hours so no permission will be needed as the estate is open to the public. Gullaid Ibrahim found the shooting location.
http://maps.google.co.uk/maps?f=q&source=s_q&hl=en&geocode=&q=london+mayday+hospital&aq=&sll=53.826597,-4.042969&sspn=10.514259,43.110352&ie=UTF8&hq=mayday+hospital&hnear=Westminster,+London,+United+Kingdom&layer=c&cbll=51.390703,-0.113663&panoid=5aoXHHc0jScXCQxeQ9D7Pg&cbp=12,329.39,,0,3.98&ll=51.390637,0.016479&spn=0,0.935211&t=h&z=11
This is the housing estate at which we will be shooting out opening.