Thanks Paul,
It was the SMB1.0 that needed switching on. My Brennan music is now beautifully married to Sonos.
The DLNA selection in the Brennan Maintenance Menu needed to be turned on; in the off position it didn't show.
On the Sonos end of things, I had to type in the IP address to connect the Brennan NAS.
Question: were the DLNA switch and SMB1.0 issues mentioned in your online instruction and I just missed it? Only learned of these things after digging through the forum and you own quick feedback. Lots of time, frustration and swearing. Update your online instruction?
Thanks again, Kirk