Thank you (and Karma) to everyone for the recommendations.
I've followed up on them all (and downloaded the Gutenberg ebook), but I'm now going to have to be quite prudent as to purchase of the remainder because of cost. (I'm hoping for another multi-use Kobo 90% code!)
Luckily my local library has Coogan's 'The Easter Rising', and I'm pleased that I'm reading the book because of all the photos. Having said that, I've purchased his '1916 The Mornings After'. I will also soonish purchase his biographies on De Valera and Michael Collins.
Reading The Easter Rising has quite agitated me from the earliest pages because of the historically well known and recorded views of a number of the English parliamentarians views regarding Irish 'home rule'.
Whilst I have been aware of these views for many years, it still doesn't make my acceptance of the issues and degradations towards the Irish peoples any easier to read or dwell upon!