ok that makes sense ... BUT I didn replace the plugs!
I returned the expensive plugs to Ford and on the way to buying some Bosch ones the light went out and the car started running perfectly. mystery!?!
defo some kinds little electrical gremlin goin on tho cos even tho she is runnin fine atm, the alarm beeps sometimes when i unlock the central locking (never did this for the first 3 years of owning the car) and also sometimes there is a delay in my dash lights coming on when i turn on my headlights. oh and my heated seats dodnt work but i just assumed that was a fuse?