Yes, that router (as well as any other with ethernet WAN & PPPoE) will work on Plusnet Fibre (as long as you have a VDSL modem (usually the BT Openreach supplied one)). If you currently use the HH5 without a separate BT modem then you'd need a different replacement router (with VDSL modem built in) or obtain a BT modem. The HH5 can be used on Plusnet Fibre if required.
Call me 'w23' At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship. Opinions expressed in forum posts are those of the poster, others may have different views.