Sonore have just made an updated version of the SonoreUPnP Bridge, as version 1.0.15 was not connecting after a reboot (1.0.14 was working fine, so not sure what version 1.0.15 updated or added)
Update to version 1.0.16 and associated library updates and connection, following reboot is re-established with the Naim network player, and presents it as a Zone in Roon.
WAV is now playing, again, on my Naim NDS through Roon from a FLAC file.