Prior to the launch of the iPhone 5s and iPhone 5c we learned that customers picking one up to run on the O2 network wouldn't get access to 4G LTE immediately. This was most likely down to Apple's certification process, but thankfully all that is now behind us, as the O2 UK Twitter account proudly tells us:

Good news, glorious 4G is now available for iPhone 5s & iPhone 5c. You need a 4G tariff, coverage and settings

If you've already picked up your new iPhone on one of O2's 4G tariffs, you'll be good to go, as well as having enjoyed a slight discount on your first months bill. If you haven't make the switch yet, hit up the O2 iPhone support page for all the information you need.

Source: O2 (Twitter), O2 iPhone support