I know, where are MNers in RL when you need them eh! Not a one of you lives anywhere near me! I could do with the help!
I did speak to that sleep nanny woman, remember, she said exactly what you've just said LG & T, that it is an issue between L and I, and that she wouldn't recommend a personal visit because L would just start playing up again the second she left.
I don't know which method to use, here goes:
Leave her to cry - I'll give in, without fail.
Controlled crying - possibly, I've done it before in the evening, its the middle of the night one that is worrying me, and L feeling confused and abandoned.
Pick Up Put Down - tried this as well, I think it provides her with stimulation and she just gets cross with me when I put her down, could go on for hours.
Gradual Withdrawal - I think sitting in a room and not looking at her would upset me even more than CC.
I think the way to go is possibly going to be CC, with short intervals in between for both of our sakes. Oh, where is SOH to tell me that this is not appropriate! I can always count on her to give me an excuse support usually!