I think I know what's happened.
I bought the spacers s/h off Mark. When I bought them, Mark mentioned I may need to do a bit of grinding if the spacers didn't sit hard against the hub. When I fitted them, they seemed fine with no gap so I didn't make any mod to hub or spacer - but it looks like there must have been at least a small gap so when the wheel bolts where tightened, the raised hub section separated from the main section of the spacer.
I think they're Eibach by the way, but it's irrelevant as it's not the spacer's fault.
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