Thanks for the replies.
To clarify, the sprocket was put on new, with a new retainer plate within the last year or so. Mileage since then has not been great - I have probably adjusted the new chain fitted at he same time twice. At the time the sprocket was fitted the shaft was fine. There was backlash between the sprocket and the shaft but that seems to be common - i've certainly seen the same with other bikes, including another XT of the same model and age.
I know that '1985' suggests the bike is an absolute dog, but actually it is very original, unabused and in excellent mechanical condition. When it came into my hands about five years ago even the cadmium plating on the fasteners was still bright. I certainly haven't abused it. I'll fix it myself.
I'll opt for a super hardened sprocket as the most likely culprit. That is still in fine condition... I think that using OE sprockets is good advice.
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