Thanks for that and I totally agree with your calcs. And in 2014...

Thanks for that and I totally agree with your calcs. And in 2014 they paid no tax and paid unfranked divs in 2014 and 2015, so after including Mar18 dividend, they still have franking credits available of $9.385mil which would nearly cover a 1.9c dividend - this would assume that they do not get further tax refunds from prior years.
And they still have some $304.6mil in tax losses at Dec17 which will cover the profits to be earned in 2018 and 2019 so maybe no further tax to be paid before 2021 so they will be paying unfranked dividends sometime next year.