Update Update, Ok compression test, leak down test, all done. Just to let you know all the science worked.
As you could see from my pervious post, number 1 and 4 down a little on compression. So valves taken out and found 1 and 4 slightly bent !!! one by 1mm the other by 0.5 mm Checked them in a lathe with a dial gauge.
But the main reason for the strip down was the plugs badly sootted up and burning oil only after 50 miles.
So thought stem seals would be the problem. found almost every one well worn. When checked against a new seal 1.5 mm oversize. So fingers crossed for the re-build.
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