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kmxsoft
Thanks all - some good info there which I am very grateful for.
I downloaded and installed Repetier host. Now Arduino is refusing to upload new firmware to the printer - it compiles fine but fails with a timeout on upload. This is new, previously I had no problem with uploading. Have removed and reinstalled Arduino thinking that would reinstall the driver, but it didn't. I can see the printers properties from the Arduino menu so I know it can communicate.
The only change was installation of Repetier host. I see the printer now shows an IP address on its menu so Repetier host has obviously tinkered with the firmware, though I didn't do more than just run Repetier host.
You can't have repetier host connected to your printer at the same time you are trying to send firmware through arduino.
You must disconnect repetier host from the printer before sending from arduino.