As an update to this, I've found out that the recently released Plusnet Hub 2 for home users allows bridge mode. The BT Smart Hub 2 (consumer version), that the PN Hub 2 is based on, doesn't support bridge mode. However the BT Business Smart Hub 2 does.
I got a new, very cheap BT Business SH2 off ebay so I can continue to use my Deco mesh as router, bridged to the SH2 as modem.
"604!!"
Edited by Toxteth_OGrady (Thu 03-Mar-22 17:39:59)