"Adrian"  wrote in message
news:H8OjvJRfcnCdFwtX@ku.gro.lloiff...
> there is the issue with the disc drive, which is also mains powered (which
> looking at my original posting wasn't clear), so I'm looking for something
> which would handle both.

Ah, I was assuming that it was powered by the USB from the Pi, via a mains
PSU that could handle the normal current for a Pi plus the extra for the
HDD.

If it's a mains powered HDD, then you need a mains UPS - or a battery that
can supply the voltage that the HDD needs (which is often 12V rather than
5V) in addition to the 5V for the Pi.

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