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Here's the series:

823 Science-fiction

FOUND IT!!
... by pure chance. It's called 'The Frozen Planet of Azuron'.

This should jog your memory:
...

Has anyone found the title of this book yet? I've been trying to track it down for some time now. Nobody seems to know what it is. I've even had my mum back in the uk, go through the attic for it.