@POLLLL You seem to be mistaken about Deco mesh: these are not extenders to Virgin Hub, Deco mesh runs its own WiFi network.

In that case, connect 2.5Gbps Ethernet port of Main Deco to 2.5Gbps Ethernet port of Virgin Hub.

Do you have 2.5Gbps port on Virgin router, too?

@Seyeclops I would recommend Option 2. This document will explain how to promote X95 to Main Deco after you added it to Deco mesh as Satellite Deco: How to Set up the Satellite Deco or a new Deco to...

@Dilby2k For speed testing, disable 2.4GHz on Main Network, to make sure Deco does not push your smartphone to 2.4GHz. Then, try speed tests again. Also, make screenshot of top part of Satellite Deco...

@Patrick1506 See if switching Deco mesh to Access Point mode will help. Switching a Deco to Access Point (AP) Mode You can also connect that printer with Ethernet cable to Satellite or Main Deco. Try...