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There has not been any further update to the Stock Vodafone Rom as yet, the current version is displayed below:-
PDA:LPC / PHONE:LP6 / CSC:LP8 (VOD)
Android Version 4.0.3
Baseband Version I9100BULP6
Kernel Version 3.0.15-I9100BULPC-CL332484dpi@DELL154#3
Build Number IML74K.BULPC
Hope this helps
Please Click Kudos if I have helped you
We no one of the problems is causes by the previouse firmware and apps that have been left on
A Full rest can fix these if that does not work and it was working fine on Gingerbread it still is possible that the firmware did not down load completly
some times a roll back and a re flase may fix this
But yes if you can let us no what bugs you have ???
Android 4.0.4 has been released but not for the S2.
Also users were reporting signal issues on 4.0.4.
Like NDJ said, some "bugs" are got rid of by a full factory reset and then restoring apps to your phone.
Most bugs are in the apps though, as some are still not optimised for ICS (I've had a few rants about this so won't bore you!) depending on what apps you really need they may work better on Gingerbread, the roll-back procedure is quite simple.
Links are out of date but you can download them from sammobile.com, then the firmware section.
Just a heads-up... I have now updated the Rollback guide and included 2.3.3, 2.3.5 and ICS.
All Links work