BT Add-on disc for Whole Home Wi-Fi (091073) | BT Shop
BT 11ac Dual Band WiFI Extender 1200 - Handset Solutions
BT Whole Home Wi-Fi, Pack of 3 Discs, Mesh Wi-Fi for seamless, speedy (AC2600) connection, Wi-Fi everywhere in medium to large homes, App for complete control and 3 year warranty : Amazon.co.uk:
BT Complete Wi-Fi review - Which?
How to set up BT WIFI Extender. Brilliant 3 step guide! - Topictrick