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Hopefully somebody with a bit more info can explain it in more detail!
Thank you for taking the time to reply, appreciated.
I do not have a service booklet but I will inspect the sticker in the boot which I imagine contains the same info. These codes seem very important/useful when looking at parts diagrams. I feel very uneasy about not knowing their full meaning, a bit like waiting for a bus in the summer holidays after ignoring the little asterisk in the timetable that turns out to mean 'School Term Only'.
Andy