London in the Destiny Canon

I've noticed that not much is known about London in regards to its lore and its post collapse survival until it fell to the House of Devils. I noticed on the Ishtar Collective that it is placed very early on in its fall but is there anything to corroborate this? Other than Lakshmi and the bounty giver in Destiny 1, what do we actually know about London on a whole? This is all stemming from my want to run a RP game using D&Destiny by Velvet Fang where its just after the Collapse following a fireteam of Guardians trying (and failing) to save London from the slow siege of the Devils. Anything anyone has on London would be greatly appreciated.