Previously working Wifi Network has disappeared on one laptop only

Jul 8, 2018
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Hi, and thanks for any help you can offer on this problem.

I have a Dell XPS 13 which has been working absolutely fine with my cable TV / router package until today (it's a Zhone ZNID-GPON-2426A-UK supplied by the cable company).

After a reboot today, my router SSID is no longer appearing in the network list (others do appear, just not the one I want). However, the SSID is still showing on a different laptop and on tablets/phones etc.

Similarly, the Dell itself can see other networks and connect to them fine.

Any thoughts?