Okay, it seems to be working again! I found the Comm Port setup in WD was wrong. The TCP/IP Connection setting had been changed from127.0.0.1 Port 5512 to 192.168.0.101 Port 22222.
As I said in my original post, I've made no changes. However Win10 did perform an update overnight which is apparentl˙ when the change took place. Not sure how that happened but it resulted in the loss of connection for Weather Display.