Thanks Merlin, that's definitely the person I'm looking for.
Looks like the 1917 Newspaper must have got the surname wrong then and I'm actually looking for the MACKAY family.
Thanks Ted ... Alice's sister Eileen was indeed a nurse and served in France in WW!. I have Alice's brother Guy fairly well researched at the moment too.
The death notice from Trove will be very useful thanks. Interesting that none of these things mention Alice's husband's name.
I thought maybe he died in WW1, but have just searched the WW! records and can't find a Mackay that listed Alice as his NoK. That doesn't rule him out as a WW1 serviceman, but it does make it a little more awkward.