Flashed this using Mobile ODIN directly OVER the KL3 deodexed firmware, no major issues so far (unable to set voicemail number).
All settings/prefs/apps preserved
Download link from Hotfile, feel free to mirror elsewhere
Beware, extracted, this file is nearly 850Mb in size
Also, thanks to anyone who roots this!
** UPDATE **
Brand new UK P6200 firmware available dated November 2012
Same as previous. I flashed this directly over my previous firmware using Mobile Odin Pro. I had to flash SuperSU binaries afterwards to gain proper root access.