It could also be said, why is Scotland, Ireland, and Wales, making statistics without consultation with parliament in the UK.
I must admit I am slightly biased on this subject because of the way things seem to have gone since December with the SNP via Nicola Sturgeon, and Ian Blackford constantly questioning the governments handling of the situation, and to my mind, arranging to have their "Scotland Update" in the morning in order to undermine the government on what the media think would be in the UK governments speech.
The Welsh, and NI have done similar things, so I am not being anti Scottish, merely saying that the figures, recommendations, etc should be the same across the UK.
The Covid situation, as most people would say, is a worldwide crisis, which means that the UK (as a country in entirety) is facing a national crisis, and should be united across all it's regions, without trying to score political points.