Thank you @peepsypops. This about sums it up.
I do find it interesting that someone from a country that has such a terrible history with colonialism and the devastation that they left when they withdrew from every country that they were in (and still refuse to leave some of them even to this day), finds the time to comment about a text book in use in Irish schools. We are at least taught about the English occupying our land, the genocide that was perpetrated on the Irish people (note it's affectionately knows by the term the IRISH famine to distance themselves from this genocide to their closest neighbours) and we won't talk about the issues around The Troubles (again, given a gentler name than what was being experienced by the residents of the Six Counties).
But let's talk about a text book. I'm sure there are plenty of UK schools using text books displaying history in a way that UK = Good, everyone else = not so good or painted in a less than favourable light.