BT (www.bt.com) does indeed provide G.722 HD voice through various consumer products. However, there’s no mention of G.722, HD voice, or wideband voice on the BT website; BT’s marketing speak calls it “Hi-dS (High definition sound)".
Sources working with BT say the carrier has purchased and deployed up to 2 million HD voice endpoints, but the carriers hasn’t provided formal statistics at this time. Currently, G.722 is provided in BT’s softphone, Hub Phones and videophones.
Thomson and Gigaset currently provide Hub hardware to BT.