Re cestlavie's 15:43:16 post of yesterday, saying "fundamentals of HBOS and the news flow around it is at worst neutral and as best positive versus its peers":
It turns out that Standard & Poor's said yesterday that HBOS is "'less well positioned to manage the deteriorating operating environment' than its peers".
As I said yesterday, when a company makes a sudden move that you (as a retail investor, rather than a trader glued to a Bloomberg screen) think is unreasonable, that most probably means there is news that you don't yet know. And not "the only realistic interpretation for this is short selling", as you said yesterday.
I hope you don't take this the wrong way, as I do think your posts are very valuable whenever there is an MN discussion on financial markets, but I feel this point was one worth making.