RobH  wrote:
> Sorry, I should have been more clearer. The Pi Zero w is connected by a
> ethernet cable via a usb / ethernet adapter.
>
> I have power cycled the router as well shutting the Pi Zero down and
> starting again as it were, but the problem still remains.

The usb-ethernet adapter is broken or unsupported by Raspbian, or the
ethernet cable is kaputt, or the connectors are, or the router is, or the
router has disabled the ethernet port.

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