As ever, I'll try and keep the emotive issues of fundamentals out of this but it's hard to do these days!

We start with the daily chart which shows a failure of the main RSI downtrend breakout and a crash through both the 166p and 158p supports. I've highlighted here the possibility of a drop to the 61.8% Fib which would also be a backtest of the previous trendline break and also at the previous support/resistance level of 147/9p. There are other possibilities which are best viewed on the hourly charts. 

Two ways to view this chart: one is with the bullish wave count I've annotated it with which shows the SP hitting support at the 50% Fib of the whole move or the 61.8% Fib of the move referred to by Ian in the previous comments. (Note also the circled Fib which was referred to on the daily chart)

The other possibility is that this was a bear flag. A break of that uptrend support would strengthen the case for that  but then there's still that 149p level to consider. If the bear case is in play, the alternative wave count would be per the following chart...

So, we can see that there are several options in play and the trick will be to know which levels to look for. Clearly 155p is a support and the SP may bounce from here (great call Ian). The question then would be whether 166p becomes resistance again.