It does the right LED flashing patterns but does nothing useful beyond that when I do the various factory reset actions. Having just setup its replacement with the same model just a new replacent I'm feeling more confident it failed (timing very odd just as I got the wireless link working, maybe an earth loop or static) but maybe I can use the USB port in it to reload firmware or summat like that, if I need another router...
Still, feeling content (smug?) I'm finally getting 100Mb throughput out here down at the end of the garden.