I don't blame you, especially given that Kia give such a good lengthy warranty id be tempted to do the same. Unfortunately we aren't in a position to buy a new or nearly new car so sticking with the focus is the only option at the moment. We could get rid and put an extra £1k in to get another used car but theres always a chance we'd get another lemon.
Thanks very much. The coil pack I changed at the weekend was like for like and a Bosch one. At the moment its running great so i'm reluctant to change the leads while its doing this. Although you can get a set of bosch ones for £30 on ebay so I might just buy them anyway and have them ready if the misfiring starts again. Its obvious the current HT leads aren't bosch or ford.