I'm not sure how long these things are meant to last but, I changed the coil pack about 25k miles ago.

I had a misfire in cylinder 1, checked the plugs but deffo no spark, so I had to swap it out. Can't be helped, she had done a few miles.
Then last week, same problem again. No spark in C1... Odd!

There is now an after market coil pack available so it was a lot less money this time (had a Delphi one last time @ £150)

Will have to see how this one gets on, I expect not much better in a Z18XER with 140k on the clock...