The last big drop I can remember that was out of the blue turned out to be the Cobre issue; maybe it is someone in the know about undisclosed bad news? Certainly a chance for anyone to get in at around 1.6p for the start of LC good news!
Frankly, most UK 'investors' are clueless regarding mining/exploration but you can rely on those in Perth to know their onions - so I'll wait and see what happens!