Cheers all. Yes its already had the recall on the coolant pipe done and looking under the bonnet I couldn't see anything amiss. Have now used a scanner on it and it comes up with misfire on 2. Would be nice to swap coils about to see if the misfire jumps cylinder, but as its under warranty I daren't touch it in case Ford get funny saying I've played with it causing the problem ? Hopefully it is just the coil.