Tony,
Just out of idle curiosity, I followed up NDIY's lead and it took me to the Traction Talk forum. One "Steamlad1" was selling, in 2014 mind you, an Archdale 18" mill with single phase coolant pump. It even gives an email contact address and mobile number. If you're feeling particularly cheeky, you could try contacting him to see if he can assist with your enquiry. He may even know the current whereabouts of the machine, assuming it sold. Here's the direct link to the web site:
**LINK**
John