okay ---- I'm still working away at this problem. The same thing is happening with both the epl 6100L and the epl 6200 L on the network. KDE sees the printers and appears to set them up. The drivers are present (it seems) ---
Type: SMB shared printer (Windows)
Description: EPSON EPL-6200L epl6200l
Type: DB driver
Model: EPL-6200L epl6200l
Description: Epson EPL-6200L Foomatic/epl6200l (recommended) [English]
--- but, though test printing seems to be happening, it doesn't really. The printer does nothing at all.
edit -- I have just "printed" this page and to the untrained eye, it looked as though the priint had happened. I dashed to the Epson in question and stared stupidly at it for about a minute. Zilch!