Yep, Safari froze on my iPad.
I couldn't use it to find out what to do so I downloaded Firefox from the App Store, which advised me to delete all Cookies, History and Web data then restart the iPad. I got a warning when about to delete the above, that this would delete the same on any devices logged into iCloud, which Safari on my Mac is.
Bricking it slightly I duplicated the Safari folder on the Mac before launching it, in case I needed all my stored data. However, everything was as I left it, including History, so I think that Apple warning was a bit of a lie!
Still, all's well...