The bit of metal has been ID'd as being the the tip off a circlip end. Advice this morning is that the circlips used in assembly aren't good quality and that impact from crashing gears could damage them. Apart from this one piece the oil is very clean - good enough to use in the lawnmower anyway.
In the meantime I'm fitting a magnetic sump bung, scrounged from a wrecked Suzuki LTF (quad) - it's the same size as DR/XF, see pic
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