Mountain Lion download freezes at 425Mb

The story's in the title...
I need to create a Recovery HD as I don't appear to have one - but the download isn't working.
I've repaired permissions, deleted cache files, checked the App Store for unfinished downloads etc etc but every time the download starts, it gets to 425 MB and then locks up with the message:
"OS X Lion failed to download - Use the Purchases page to try again."
Any ideas anyone?
Andy

I'm beginning to think the new user option is my only one. I've tried repeatedly (including using Ethernet instead of WiFi, Restarting the Router, and attempting the download in "Safe Mode") and failed every time to get Mountain Lion to download.
I doubt it would consistently fail at 425 MB if the wifi were causing the problem, but all the same, I connected via ethernet cable - to no avail. I even tried pausing the download at 400 MB, then switching off and disconnecting the router for five minutes - but that had no effect either.
And I tried downloading at 5 am this (Sunday) morning, just in case it was heavy local usage that affected it, but again, it wouldn't be consistent if heavy traffic was the issue.
I just paused it again, and will restart the Mac before resuming, but I don't hold out much hope.
If anyone has any ideas on this, I'd be most grateful.
Andy

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