Known as the Pedestrian Scramble in other countries, this is a pedestrian free-for-all. When the signal is given, pedestrians may cross in any direction, including diagonally. The first X-crossing in the UK was in Balham in 2005 (see photo below by Nick Cooper at en.wikipedia CC BY-SA 3.0)
Although very popular in Japan, there are only a few other places where you can find an X-crossing in the UK (Swansea, Wimbledon, Wood Green, Oxford Circus and now Harrogate in 2015). There is some controversy concerning their safety, especially since a recent collision at the Harrogate crossing between a vehicle and an elderly pedestrian resulted in the death of the pedestrian.
(photo by Mike Roberts from London, United Kingdom – New Oxford Circus X-CrossingUploaded by Sceptre, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=8377071)