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@Ozzeh
If you want to try a custom ROM then don't worry too much about resetting it back to default afterwards. You can download the carrier branded firmware your phone came with from a thread on XDA-Developers here:
http://forum.xda-developers.com/showthread.php?t=1113928
There is a counter on the phone which will show up that you've flashed a ROM on there but it's very unlikely that o2 will notice it. If you're worried then you can reset the counter using a USB Jig:
SAMSUNG GALAXY S2-I9100 USB JIG RESET flash count to 0: Amazon.co.uk: Electronics