Samsung doesn't look to have provided an upgrade path from G8 to H6 for the UK O2 firmware yet, even though the firmware is up on the web. That means that their server doesn't provide the keys to decrypt it. I don't know why; they do for every other carrier with a newer firmware posted. This is probably why we haven't seen it floating around yet.
No, there's nothing available for September yet; I'll be sure to let you know as soon as I find it! Since b33r's device has it, I don't suspect it'll be very long before it becomes available. (Although September is almost over... ::sigh:
I'm not releasing any software at this point because:
a) I don't have anything with a very usable GUI yet,
b) It doesn't provide any immediate benefit to anybody because there are no new firmwares that you can obtain this way that aren't already available and, most importantly,
c) A large potential exists for abuse, which might prompt Samsung to change the way their clients request upgrades to something that is potentially much more secure (i.e., bad for us).