@Julie100 it is possible there is an issue with your hub or line but in practice these are actually extremly rare as full fibre is far more reliable technolgy than VDSL over copper. Something is clearly wrong if a direct ethernet cable from a gigabit equipped PC is showing speeds as low as you report. However things like powerline adapters etc in the connection can easily restrict throughput so make sure it is a direct cable. When talking to Sky keep to the speeds over ethernet as wifi issues are so common Sky will assume those are the issue as in the vast majority of cases they are..
Sky run a daily test on the speed of the connection to the hub which you will find in the service checker in the My Sky app if you click on the last result it will give you the results for the previous month there is nothing to duggest these results are not correct. It is important to realise you are buying a connection that will deliver up to 900Mb/s but you are not going to get that full bandwidth all the time as you are sharing a connection with up to around 30 other people on your local distribution point. This isnt Sky being mean its simply how the full fibre system Openreach operates works to enable reasonable costs. Sky have a guarantee of a minimum of 600Mb/s if your speed falls below that for 3 continous days then they will refund one months payment. .
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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
