@Wally11 I am assuming you still have Virgin Hub3 router and your old computer connected to it wirelessly. You also still have Deco mesh running in your house. With these assumptions, as a first step...

ImtiazAli wrote @Wally11 Remove the virgin hub & set up the decos again @ImtiazAli This is not the best recommendation for the person with limited IT knowledge. You must know that Virgin hub 3 is...

@merlin777 To achieve what you ask, you will need to configure Deco in Access Point mode. By default, when you configure first Deco which will become Main Deco in your Deco mesh, it'll run in Router...

@Siem87 TP-Link TL-SG105e is unmanaged switch, it should not need an IP address. That topic is discussed here: https://homenetworkgeek.com/does-a-network-switch-have-an-ip-address/ There is something...

@josemikkel I have gigabit Internet, which allows me to test WiFi 5GHz performance to the max. On Main Deco M5 I am getting up to 475Mbps. On Satellite Deco M5 the maximum I am getting is 225Mbps....

@josemikkel As a first step, turn off 2.4GHz band in Deco Main Network, and re-run speed test on mobile device connected to Main Deco 5GHz. If that does not make the difference, check this document...