You need to set the TP Link to Bridge/AP mode if you’re leaving the Virgin Hub in Router Mode
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When you connect the devices together, do you get a link light on either the TP-links Ethernet port or the hub port? If not, replace your cable.
I would be surprised, as most modern equipment caters for it, but historically, when directly connecting two “like” devices together (two pc’s, two switches, two routers etc..) you used to need to use a “crossover” cable, rather than a standard cable.. the cable looks identical, but some of the wires are switched (or crossed-over) inside so that the send pin at one end is wired into the receive pin at the other end and vice versa..
most modern equipment implements something called MDIX to take care of this without you ever realising that it’s a problem... but ya never know..