@Gemma873 changing the hub is unlikely to improve speeds to bthe hub but the older flat Sky hubs need replacing as they no longer meet current security requirements. The email,had a link to grt a new hub or just call Sky.
You can check the speed to your hub by runnning the service checker in the My Sky app or website as Sky tests thst everyday. If thst is yhe issue talk to Sky but if the speed is as it should be then your issue can be down to acslow wifinconnection in your homecshichbthe new hub may help with.
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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
