Ianp,
You are correct.
There is no such thing as a system. So don't trade between 12 and 2. Go shopping or something. You've identified a weak spot in your method.
I've been trading Ftse future from P&F breakout entry points for 3 years. I agree it will "kill" you on lack of range on a quiet day. The whole point of trading Ftse IS the day's range. You know it will break at some stage, but you must have momentum. Be patient. If you manage the signals with MAs, stochs, RSIs or whatever you fancy, you will make money. Don't go in when the market is flat. I keep hearing about CCI, so today I've been playing with the 14 CCI on a 1min . I'm not sure how to use it so I tried it with the zero cross. Very useful. P&F, CCI, MA or whatever, use your favourites, when you're happy - go! P&F can get you in but you need to be selective.
If you wait for the signal to reverse before you get out you may need a lot of equity. If you set a fixed stop you'll get stuffed. The P&F target counts are a good level to have an objective and your pocket is a good guide for the Stop, if nothing else is obvious. It's the individual's choice of trading style once "in". I use 3x3 and 2.5x3 to get in. I sometimes use 2x3 to see the short term on when to get out. You must adjust your style to the market.
Be confident, P&F breakouts work.
Be lucky