Thank you Philbert and also Ringo,

The solution is turn both router and printer off, and with the computer on, turn on first the router, then when it has 'fired up', turn the printer back on.

Think that was the solution that was proffered on NAT way back!

I am not a highly tech guy, but it seems similar to when a computer gets its toga in a tangle - turn it right off, then let it re-boot.

Thanks agian.