Shadetek.
I replaced the fuel filter before this fault developed, but there was no obvious change in performance.
I have now replaced the fuel pressure sensor. The car no longer stalls and appears to drive perfectly well. It has no codes and the idle issue has gone. However, it smells "fumy" to me for no obvious reason.
The soot on the back of the engine was caused by the gasket on the egr valve slipping, leaving a small gap, when it was replaced. It has been installed correctly now.
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