Gav,
I had the same thing happen to me a little while ago.
My iPhone crashed whilst using Google Earth, of all apps. It wouldn't turn off. I had to force a reset and had to resync/restore from backup through iTunes.
I have about 15-20 GB of data on the device and it took about 4 hours to restore everything. Mind you, I have iTunes running on a 5 year old notebook, so, it's slow at the best of times.
H
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