For those with a Vodafone NZ sourced Galaxy S II, there is a firmware update available on Kies:
PDA:KG3 / PHONE:KE7 / CSC:KG1 (VNZ)
Oddly enough, it is still 2.3.3 (despite the leaked 2.3.4 firmware also being labelled KG3) but curiously has some 2.3.4-flavored features like video chat in google talk.
I didn't think to note down the kernel version before flashing CF-Root - lost root after flashing.
Android Version: 2.3.3
Baseband version: I9100XXkE7
Kernel version: 22.214.171.124-I9100XXKG3-CL401405 se.infra@sep-35 #2 (this is the CF-Root kernel)
Build number: GINGERBREAD.XWKG3
...as a footnote, have just realised there is no 2.3.3 KG3 CF-Root kernel available, but the 2.3.4 one seems to be working OK (gulp!)