Thanks. Adding a formfeed resulted in an empty page, so there are clearly possibilities but since I can't find a quick PCL example[0] and lpr suits me fine I'm not going to investigate further.

[0] I'm assuming PCL is most likely supported, and I remember having worked with an EPSON dot-matrix printer (i.e. probably using ESC/P) in 8-bit days and that it didn't require special commands to print basic text.