there is a wiki that is compiling cities it can be found here:
http://dresdenfilesrpg.wikidot.com/on the rest, without giving too much away as i know that some of the people who will be in the game lurk around here.
a] im leavin the monarchy out far too much temptation for players to mess with this hehe, however im saying they are generally protected due to the heat messing with a royal would bring on the supernatural world, and i like playing at street level maybe county level campaigns.
b] im saying that the british police are largely unaware of the supernatural world, but there is a SO unit who well deal with Special Operations hehe.
c] there is so much we could do with borris johnson hehe, but again im keeping this level out of the game.
d] here i can help, after reading about the rise in foxes in london and other wild animals i decided to have a floating city aspect WERE-NATION, a small group of weres are annoyed that their 'culture' is not represented in the accords and are building a small nation in and around london, much to the chargrin of well every other supernatural nation.
when it comes to jack the ripper im leaving him out, far too many london based supernatural games where hes come up, im putting him down to the workings of the occultist Nicolas Hawksmoor, who created alot of the churches in and around the areas the ripper killed people, in various occult books on london they suggest that he built his churches along various ley lines and they spell out an occult symbol when linked together, some have suggested that these churches are near some of the worst attrocitied carried out in london, and it is due to this occult symbol.
now my campaign [without going into it too much] is going to be about the giants of london, black dogs, black annis and the mythical foundings of london also the gates of london.
hope this helps, and i would love to hear of everyones dresden london im sure there are great ideas ive missed.