@Lee1218 where the online system indicates an upgrade is possible but wont complete you have to call in. It doesnt tell you why but Sky need to talk you through some steps and get your informed consent. For example they need your confirmation you are happy yo have your voice line switched from copper which works during power cuts to over fibre which doesnt. You will almost certainly need a nee fibre line run which invloved drilling holes etc. Lead times can be many weeks which is not down to Sky but Openreach who are very busy.
In summary its a bit complicated and more than a click in a box can often sort.See https://www.openreach.com/help-and-support/full-fibre-broadband-installation-checklist
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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
