Back to the main topic here ... if I may ...
For the site that suggests the legal stand for photographer, may I suggest: -
a) You check with the police and council of London as to what are their interpretation of the law ... and add some reference to that in your site.
b) You put a link in your site as to where a "professional" photographer can get a license to shoot in the restricted parts of London / UK.
c) You consult with a reputed law firm, and this will cost you, to get the legal ramifications for hobbyist photographers .. make reference to the documents you receive from the law firm.
d) Make your site PDA & Smart-Phone friendly, so that any photographer can access it while out in the field. This would be most useful if we are faced with a sticky situation with the police and need to make a quick reference to something that would show the police / authority that we know the law and are within the law.
e) Keep updating the site as you invest more time with the authority - yes, you will need to get their side of the card too - so that the information you have is always as accurate as can be.
d) Add a disclaimer in BIG BOLD letters to ensure that no one follows your guidance wholeheartedly and end-up in deep trouble. That would mean a HUGE lawsuit coming your way!