I just found this which states that Sky have been using it since Easter 2013, but what I note in there is that it confirms that as we suspected that BT has indeed been trialling it on VDSL since 2013. -
link Re the TG582n - the DSLchipset in those routers is actually very good. I dont deny that its been around a while now and the wifi isnt brilliant, but when it comes to the DSLside its damn good. It has a BCM6328 chipset (same as the HG612 & most of the Billions).
Despite having several routers available I stuck with the TG582n when on adsl2+ because it gave me the best sync speeds and was rock steady. This is why so many BE users liked it. Any moans about that particular router are all to do with wifi not the DSL chipset. Its because of its chipset and DSL stability why ISPs such as AAISP and Zen also recommend it.
Due to its BCM6368 it should natively be compatible with g.INP so no idea why it shouldnt work when on Sky. Be* were talking about implementing g.inp on their MSANs several years ago before they got bought out. afaik they trialled it, but never got around to rolling it out to all their MSANs.
It's the modems such as the ECI's which use a Lantiq VRX-268 chipset which may have problems and need updated f/w. This includes the HomeHubs, but BT will automatically do that via the BTAgent. All the BCM6368 and BCM63168 based routers should be fine.