The Google-branded handset cropped up on the UK store chain's inventory system, where it was listed as being available in black and white models, The Verge reports.
Google uses the Nexus line to showcase the new version of its Android operating system, with the Asus-developed Nexus 7 tablet serving as the launch vehicle for the most recent Jelly Bean iteration.
Previous reports suggested that the LG Nexus 4 will carry a refreshed version of Android 4.1 Jelly Bean, rather than the rumoured Android 5.0 Key Lime Pie.
Earlier this week, an industry analyst claimed that Google is partnering with Samsung to launch a high-end Nexus tablet as a competitor to Apple's iPad line.
The LG Nexus 4 has been tipped to sport the same form factor as the firm's Optimus handsets, with a 4.7-inch screen with a 1280 x 768 resolution and 1.5Ghz Qualcomm Snapdragon S4 Pro processor on board.