@Angela28 a TV buffering is usally caused by poorcWiFi signal level. Check you have your hub in the best place which is on a surface well away from other electrical gear above obstructions like radiators. You may need to buy a loner Ethernet cable to link your hub to the ONT unit the engineer fitted. You dont need anything special. Ethernet cables are easily bought in varios lengths on-line, at hardware shops or most larger supermarkets.
If that doesnt help consider upgrading to Sky's WiFi. Max bundlecwhich can provide extender pods to improvecthe WiFi signal.
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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
