This has been an informative discussion which I have followed with interest; perhaps one of the better uses of PPRuNE.
Personally though, after my own experience mentioned earlier, I don't fancy flying in SN again, unless I was IFR in a de-iced machine; even though it was accidental it was a little foolish attempting VFR through SHSN.
P.S. Thanks for the Wiki link earlier, bookworm. I got a bit of a laugh at that.
Smithy