For sale Zyxel 8924-B10A: a VDSL2 modem/router.
This model is highly ranked by specialist communities like Kitz forum and Thinkbroadband.
Arguably, it's best connected to a Huawei cabinet, which is Broadcom-based, just like this Zyxel modem/router.
Although this has VOIP capabilities, please note that it'll not work with BT digital voice, given that you need to use their Smart Hub to have access to it. However, this will work with any other digital voice providers, such as Andrews and Arnolds etc.
This is the John Lewis broadband version that was connected for a couple of hours to test our noisy VDSL2 line. It'll work with any other ISP.
(We ended up using a Fritzbox and now also have FTTP, so this Zyxel backup is now redundant.)
Collection: Eskbank
Please do contact me if you have any questions.