££......Osmetech ......Smell the Success.....££

Wing that is correct, but the theory would mean all SPs would be close to zero as the buyers would wait and the price would keep falling back to zero. In reality there becomes a point where the buyers feel the SP has become cheap and will start to buy back, hence previous support levels being good markers (if the buyers thought it was cheap 3 weeks ago, they are probably starting to think that now).
I am of the opinion here that I am happy to buy in early and be in for the ride, I started buying more just as the share price went below the placing price in October, the price went lower and I kept on buying, there were those saying it would still go lower but when the trading statement came out they missed the boat and were buying at 17/18p (I got the majority of mine at 13.5-14.5p). Like the trading statement, the FDA approval has been well flagged, we just don't know which day we will get the RNS, so as I said the other day, I don't want to be sitting on cash trying to eke out another half pence or so, only to wake up one morning with a big fat 'A' beside our name at the top of the leader board.
This is my opinion, everybody will have a different view, good luck to all,

Trout.