Fuel filter was changed about 3 months ago so hopefully its still all clear.

Nope, I am not 100% sure that it is a fueling issue.

The car seems to idle ok which is why I hadn't considered a misfire.

Would it not pop and bang because of the extra fuel in the cylinders?

Drove it to work this morning and it seemed ok until near the end of the journey (previous to this i had been driving like miss daisy). I planted my foot (out of curiosity really) coming off a roundabout and it just kangaroo'd along the road