Jhieminga - thank you. Yes, I decided similarly but access was still denied.
The actual message (under a red warning triangle) was "Yourconnection is not private. Hackers might be trying to steal your information from google.com - e.g. passwords etc.
NET ERR CERT AUTHORITY INVALID
below that were two check boxes ADVANCED ........... RELOAD
Checking either took me back to the start !
However...
I tried again today and all three machines made wifi connection and m'lady can indulge in the 'Screami9ng sequins' show again !
I have no idea what, if anything, has changed !