Silverblade, check out your local B&Q store [I kid you not], selling a Sentry Fire Data safe for £99 and it's a decent size.
It's good for an hour up to 1000 degrees, I managed to fit my XHD, my House deeds and lots of holiday photo discs plus all my other back up discs too.
Normally retails about £250 so I don't know how they're doing it so cheap!

Injustice will be avenged.
Cofiwch Dryweryn.