It remains to be seen whether there's a legitimate market for head-mounted, augmented reality devices, but as ever, Google is having a pretty good go at building a suitable device for this emerging space. The Explorer Edition of Google Glass has just spread its wings to the United Kingdom, opening the door to a wider roll-out in the run-up to the eventual consumer-end release, but while Glass is commanding the lion's share of coverage, plenty of other companies are working on something similar. Lenovo, to whom the Big G recently sold Motorola, has a product on the go that looks almost identical, and having just taken the wraps off the unnamed HUD, also gave a very brief overview.