Does Dataset_GB apply to Republic of Ireland (ROI, Eire) as well as UK? Is that why it's called Dataset_GB, not Dataset_UK?
Do they know that Great Britain is just the name of the largest of the British Isles? so includes England, Scotland and Wales but not Northern Ireland, Isle of Man, Orkney, 3x Channel Islands, which are all semi-autonomous parts of UK. GB certainly doesn't include ROI.
Given history, if I was an Irish national I would object politically, if Dataset_GB assumes that I'm 'part of GB'. A better name might be Dataset-BI, for Britain+Ireland, or British Isles.