Problem solved. Sorry to have troubled this forum. It was nothing to do with Windows 10. Kaspersky on the laptop was treating the WiFi network connection as a public network and was blocking it....

Thank you for pointing me to this. However, the query on this thread relates to accessing the internet. Both my computers can get online with no problems. The laptop can do so using either Ethernet...

I have two computers: a desktop with no WiFi (Ethernet only) and a laptop (Ethernet and WiFi).

Using Ethernet on both computers I am able to see and share files both ways and all works perfectly....