Yeah, it was bad luck. They were rusted through so I didn't stand a chance.

I just can't believe the plugs aren't part of the Ford service, at least a removal and inspection for crying out loud! The car was bought new from the local dealer and was serviced there while under warranty, but they didn't touch the plugs once, which is standard practice until 30k miles when they are changed... by which time they are rusted solid!

I'm also trying to source a second hand head that's got no plugs in it, it might end up cheaper than having a machine shop remove the remainder of the plugs, but to be honest I have no idea what to expect to pay for either.