@angus748 if you need the full download speed use a gigabit ethernet connection. Speeds over wifi will vary due to the layout of your homecand what lies between the hub and the device. The black Sky Hub 4.2 is a WiFi5 device that tops out around 650Mb./s while the white Sky Max hub offers WiFi 6 which will enable you to get 900Mb/s overcWiFi when reasonably close to the hub.
To get speeds over 600Mb/s through out most houses would require multiple WiFi6 third party access points and can get very pricy. Before splashing out though consider what speeds you need as apart from downloads most apps cannot use 100Mb/s for examole streaming sport in UHD requires under 35Mb/s.
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
