No apologies required!
Any info was quite welcome to me! My problem was largely due to the faulty/failing coilpack. Replacing the plugs and wires was a cheap solution in my hunt for the problem. As a consiquence I got to experience the cracked plugs and the fact that only AZFS-22PP will work in th Zetec!
When I get time I am going to gap the plugs at spec.
Danny Brown