i'm fairly sure if you root the phone for flashing custom ROM's etc then this will void any warranty, including Uk ones?
To be honest, i've noticed no difference in performance with the ICS update, apart from the random battery drain every now and then. It adds a few new useful features like data tracking which warns you when you are near your contract limit, but there is nothing there that you would say "yes, i must get ICS".
better to stay on a stabled gingerbread. I wouldn't have upgraded if i knew of the battery issue.
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