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Hi there Val. Umm, do you mean glow plugs? What were the other three like? I've no real idea myself (these are my first diesels) but, at a guess, the element has blown, like emersion heaters sometimes do. I've no idea what to suggest really, I think you're running the risk of damaging the thread in the head and I'd guess the only safe way is to have the head off (hopefully someone will come along now and contradict me). Maybe you need to talk to a diesel specialist (not Peugeot!)

Tricky one that and one where you'd either have to do it all properly (head off) or if it's an old school XUD use an 'easy out' type thing to clean up the thread and take a chance on any bits that fall into the cylinder