>> it misfires a little but only when under load - when revs are low in a gear and I give it some beans. Just a single misfire.
I spent 14 years diagnosing and fixing faults such as those by using a Sun or Crypton engine analyser, but things have moved on a tad since then :)
Loads of stuff on the internet/YouTube to help you, such as :
"Intermittent misfires are the worst kind to diagnose because the misfire comes and goes depending on engine load or operating conditions.
They seem to occur for no apparent reason. The engine may only misfire and run rough when cold but then smooth out as it warms up. Or, it may start and idle fine but then misfire or hesitate when it comes under load.
Also, it may run fine most of the time but suddenly misfire or cut out for no apparent reason. Intermittent misfires can be a real challenge to diagnose"
www.obdii.com/articles/Diagnosing_Misfires.html
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Ford Focus II - Focus misfire new
Ford Focus II - Focus misfire new