@MHodgson
The phone line is likely dead because Sky users VoIP which is provided by plugging the phone into the back of the router for the telephone. As for the speed, you'll need to provide further information, eg: whether it is wireless or wireless and wired ethernet-connected devices that speed is slow.
Can you post a speed test and the details above over a wired connection, please?
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Zen internet on FTTP (900Mbps down, 100Mbps up). SAT> IP (Apple 4K 2nd gen TV to LG C1 OLED UHD TV/Dolby Atmos Denon AVR, DacMagic Plus for Hi-Res audio), hosting own blog/forum (cluster), OPNsense & Zenarmor L4/L7 NGFW & DPI IDS/IPS, Asus ET12 Pro Tri-Band wifi, Linux, Gamer: Xbox Series X/i7 laptop, round-robin DNS over HTTPS, non-proprietary VoIP HD AMR-WB (G.722.2) and more... Beta tester Apple iOS/watchOS/tvOS/iPadOS/macOS.
