Siku wrote:As a timeline how about this:
1) LL lives at 12
2) Diane moves in with her
3) they split up
4) Diane moves into 17, taking 'her' stuff with her in boxes. But as can happen in a split her stuff and LL's stuff have got mixed up
5) Diane is too depressed to unpack/move in properly
6) LL tries to get HER stuff back from Diane
7) in the dream LL just lies (Diane is writing their relationship out of the dream, creating Rita as an amalgum of LL and Camilla)
By Gads! I think it works! (Now shoot me down

)
Damn! This doesn't really explain why D Selwyn is listed at 12 and DeRosa at 17.
(Although it does suggest the Lamp Lady isn't DeRosa)
How about
1) Diane moves into 12, and writes a little sign on the wall so all the casting agents can find her.
2) To her surprise Diane finds LL in the shower of 12
3) LL is amnesiac and doesn't remember where she lives. On the plus side she's a hotty and romance ensues.
3) They set about discovering LL's identity, it turns out she's DeRosa and lives at no. 17 - wow!
4) 17's nicer so they bed down there
5) They split and Diane kicks her out (It's not easy for me!)
6) LL has no where to go but back to 12
7) Angry at being evicted from her own flat but too scared to confront Diane LL calls the cops (those two detectives came by again)
8) The cops prove too useless to uproot Diane, and finally LL snaps. Dressing up as her mother and accompanied by Blonde Camilla (dressed as her mother's gay best friend) she breaks into 17 and brutally machine guns a sleeping Diane
9) Arriving just too late the Cowboy comes to 17 to offer Diane the lead in the Sylvia North story. To his suprise finds her dead body riddled with bullet holes
10) ...you're now in the process of recasting your lead actress.