We wrote about the 2.1 update possibly coming to the UK a little over a week ago. Well apparently good things come to those who wait. HTC Europe has begun pushing out groundwork for the 2.1 update OTA to Hero owners today. If your phone receives the update, you will see a notification on the phone and all you have to do is press OK to accept the update, which will download via your data connection or wifi. After installing the update, you can verify it installed correctly by checking the Build number.
From the Home screen, go to Menu -> Settings -> About Phone -> Build Number. Once there, the new Build number after the update will be 2.73.405.93; 2.73.405.94 (Nordic) & 2.73.405.95 (Greece/ Ireland).