It's a scratch remover polish that's available from Halfords IIRC, and it's a deal better than the overly harsh T-Cut equivalent by all accounts.
Like I say it may well not completely sort out your bad patch, but even if it doesn't completely shift it, if it does help a bit then you'll know it can be polished out. If it doesn't touch it at all, it goes some way to confirming it's sub-surface.
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