FWIW, after '
yum install cups-bjnp' I have now got the printer working nicely with Centos.
And it is shared over the network.
Unfortunately, whilst OS X can see the shared printer, it doesn't seem to 'just work', it wants to know what driver to use. So, back to square one as there is no official OS X driver for that model.
TBH, I'm probably not going to expend a great more effort on this. The printer stills works on my own Mac Mini (older OS X) and for the time being that is shared with the newer MAC. And that suffices, though it gets irritating that it (unsurprisingly) stops working when my system is in standby, and may stop altogether when I update to El Capitan.
I've a small stock of cartridges but as and when they begin to run down, I may start window-shopping for a shiny new printer. Darn, just said the W* word after all.
I'd rather avoid anything other than 'out-of-the-box' operation for the new Mac Mini as it's not really mine, it's other half's. She's perfectly capable of installing other packages or adapting to other solutions but this is her first foray into OS X, and I want her to have a good impression, it would be nice to keep things simple and 'by the book'.