Following Sony's press event in London today, UK carrier Three has become the first to announce availability for the large Sony Xperia Z Ultra handset. Three didn't expand on Sony's Q3 launch timeline but is letting us make advanced plans about where to get the 6.4-inch Full HD handset.

As we noted in our hands-on earlier on Tuesday, the Sony Xperia Z Ultra handset is only a half an inch smaller than the Nexus 7 and other tablets available on the market. Its ginormous design doesn't take away from thinness, however, as it's only 6.5mm thick - which is actually pretty thin. You'll also find the ability to repel water and dust on the Xperia Z Ultra, just like its Xperia Z brethren.

"Sony have just announced the latest device in their Xperia range, and we’re very pleased to confirm that you’ll be able to get it on our Ultrafast network soon," Three wrote in a blog post. The carrier didn't touch on 4G LTE (which it aims to support by the end of the year), even though the Sony Xperia Z Ultra does support it. The Ultrafast network that Three references is essentially faster 3G DC-HSDPA technology. 

Sitting at the core of the Sony Xperia Z Ultra is the new quad-core Qualcomm Snapdragon 800 chipset, clocked at 2.2GHz. There's a 3000mAh battery, which Sony says will give you 11 hours of 3G talk time. It's a 4G LTE handset, offering 16GB of internal memory, expandable via microSD up to 64GB. 

We'll be on the look out for further details.