If you are looking to set a static IP for a device, then you need to do that at device level, best to keep away from any DHCP ranges set up.
If it's for the ADSL line, then if you have paid Plusnet then it will be set for you.. check your IP with whatsmyip..
Re: How to set a static IP on Hub One router
You will need to log in to your account and add this and pay £5 I think that it comes as Add Ons. Once activated just reboot your Hub to pick up your fixed address.
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