I'd be fairly sure that the USB port on the router won't supply enough power for the RPi.
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That was one of my assumptions, do you know if there is any problem with the following adapter https://www.argos.co.uk/product/1420579 connecting to the plusnet hub? When I try to connect via this it does not connect to the hub but when I try to connect to my mobile hotspot that works perfectly fine.
That adapter ought to connect fine to the PN Hub. If it's a Hub one then try splitting the 2.4ghz and 5ghz bands by giving the 5ghz one a different SSID. That adapter isn't 5ghz capable and sometimes having both on the same SSID can confuse some adapters.
Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.
