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If you see a powerdown you didn't authorise, you can always use your password to change your active key and cancel the powerdown, as I understand, although you'd lose anything you were holding in liquid form.
Either way, just dropped in to confirm these instructions worked a treat.
I'm going on holiday for a bit, and just delegated my voting power to @holoz0r.
I can already see it in his wallet. Thanks @timcliff.

Actually I guess with the possession of an active key you can always change the active key itself..

And undelegated okay a month later. Thanks again.