>>> I thought it a good idea to explore Bridge
>>> Connections in Network Connections. Yep, this
>>> is when it all went wrong & I can't find the way back.
If you've bridged connections, you'll have connections in the bridge and the bridge itself. Right click each of the connections in turn and select 'Remove from bridge'. Then right click the Bridge itself and select Delete.
Make sure the Wireless Network Connection's TCP/IPv4 settings are configured to get both IP and DNS addresses automatically.
Then delete any existing wireless "profiles" and go through the procedure to Connect again.
See if that gets you sorted.