Thankyou Rhonda so much for this info!
The clues that Eric was in Canada and that his sons were born there are a big help! Looking at the maps Red Deer is not far from Nevis where we suspected Eric had gone to in the early 1900s, most probably pre WW1.
Replies to my posting also indicate relatives in white pages in Australia who i can write to. I now hope to find Eric in passenger lists going to Canada, but would also like to discover when he went to Australia! What incoming pax lists are there for Australia, tho not sure what years to look - inter war years.