Is it worth fixing a 2011 Renault Clio with a possibly broken cyclinder?

My sons petrol 2011 Renault Clio 1.2 has ended up in the garage this week after performing more and more sluggishly over the last seven days. The mechanic reported that there was virtually no compression in cylinder two and, after further investigation with endoscopic camera, he reports there is so much "soot" inside that he can't really tell what's going on. His best suggestion is to remove the cylinder head to investigate further. However, as the car has now covered nearly 63,000 miles I'm sceptical as to whether this is worthwhile. If not, what would you suggest is the best course of action?
A 2011 is worth fixing. You don't state that it has been using oil, so has probably been overfuelling through a duff injector and that has created all the soot. I would check the injectors before taking the head off.
Answered by Honest John on

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