Kies always gets the updates first. ALWAYS. It WILL become available OTA eventually but personally I've no idea whether that's a day later, week later or month later.
Personally I don't know what the issue is some of you seem to have with Kies. It's a solid software and the best way to manage your phone without rooting. Certainly the safest as if anything ever DOES go wrong it would be covered by warranty.
If you're on BTU and want the upgrade now then you'll have to suck it up and use Kies. (Or use Odin but if you trust that over the official route then god help you). Otherwise sit tight for a while longer and the upgrade will eventually become available OTA.
I could understand if it was Blackberry's horrendous desktop software but Kies is just fine.
@EasyDuz - The only way you could restore stock, unlocked UK firmware to your phone is to flash it manually using Odin. Enter *#1234# into the phone dialer and check what three letter region code is displayed in the CSC. That will help you discover what firmware you're currently running. You can download the BTU LK7 firmware from sammobile.com to flash with Odin. Once you have that installed perform a factory reset from recovery (I actually recommend two) and then Kies should recognise your phone and you could use it to upgrade to Jelly Bean MC8 firmware.