My Peugeot 106's spark plugs have a bit of water on them - is this due to a failed head gasket?

I have just bought a Peugeot 106 XSI 1.6 8v. It was running a bit rough on low revs so I took the spark plugs out and they seem to have a little bit of water on three of them - do you think it could be...

Garage musing

I was a little concerned to read that a Ford dealership in Bristol had consulted with Ford, and suggested that seized spark plugs could be “smashed out of the head”. Why? Hardly good engineering practice. The...