The BBC is saying that we should recieve our updates today. sounds like you've already had yours though..
to make sure, press the power key to lock the phone, open up the keyboard and hit enter a couple of times - the unlock pattern screen should appear - type reboot and hit enter. if you reboot then you need the upgrade, it not, gratz! your all upgraded.
This will be the first UK upgrade as far as im aware, which means every fix from the american TC4 RC19 through to RC30 should be included. might be a biggy.