Cam timing is well out, explaining the engine light and stored codes, but all compression is good - 200-250PSI. So the head is fine. I’m half thinking the oil leaks are camshaft seals. The lower part of the cam cover seems to do a good job of stopping oil from slinging much - hence my earlier misapprehensions about where oil was coming from.
I’d have expected low oil pressure to be stored as a fault code?