While it was only a week or so ago that the Android 5.0 Lollipop update started rolling out to the Samsung Galaxy S5 in in Poland, Russia, Malaysia, and Spain, late last night it started rolling out to the UK version as well. The firmware for this update was still the older Android version 5.0 (LRX21T).
The most current build that is being worked on for most flagship devices is Android 5.0.2 (LRX22G), but it looks like Sammy decided to push this one out anyway. We fully expect them to add the 5.0.2 update later on down the line. For folks in the UK (or any of the above mentioned countries) there are a couple ways you can get your update.
If you want to update manually via Kies by connecting your device to your computer and use Samsung Kies 3. Alternatively, you can also download and install the firmware via FOTA, go to settings > system > about device > software update > update.
The video above is from SamMobile and shows off Android 5 on the Galaxy S5.
Source: Samsung rolling out Android 5.0 Lollipop update to the Galaxy S5 in the UK SamMobile