Fatal miscalculation by central government in assuming there is a single soul in Scotland who hates trans people more than they hate the English.
Minor point: the veto power was intended specifically for situations where a devolved parliament passed legislation that adversely affected a reserved issue, eg. voting to give themselves moar sovereignty.
Using it on GRCs is massive overkill. They claim the GRC bill will interfere with the Equalities Act, but there are already gender-based incompatibilities between Scottish and English law insofar as marriage law differs ...