Thanks. After fiddling about for a while I deleted the drivers/software off the PC, and reinstalled. Didn't work for a bit while there was only one printer icon 'in error state' in devices and printers, then PC came up with an epson firmware update, which it installed with no problem over wifi. Now there are two icons in devices and printers, the original one 'in error state', and other that WORKS!
Who knows what the issue was/is, but a least it prints over wifi now.
edit. Bah! error state again. give up.