Sky have asked me
Is your ISP Sky or BT Retail?
If BT, Why are you talking to Sky?
If Sky, you are not on BT Infinity, which is only a trademark of BT Retail. Your fibre is FTTC provided by BT Openreach, via BT Wholesale. And why are you posting in this forum?
I have chosen to use my own router and the not the BT hub.
Also, if Sky, you will not have been offered a BT Hub which is only supplied by BT Retail.
I think you are confused between BT Retail's proprietary BT Infinity and the FTTC sold by all other ISPs.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC