A former admin on this site.
Kept for other contributors to note:
Thanks for your note - I have loads of photos licensed under cc-by-sa. They are listed on http://en.wikipedia.org/wiki/User:Secretlondon/Photos - Open guides can use as many or as few as people want. It includes bizarre things such as lots of tube stations, docklands and centrepoint, lots of south London etc. They would need to be hosted somewhere. Secretlondon