Gina Miller, whose court judgement successfully forced the government into holding a vote on triggering Article 50, has claimed that an increase in spending in Northern Ireland will automatically entail spending increases in Wales and Scotland thanks to the Barnett formula. This allocates funding for Wales, Scotland and Northern Ireland based on spending in England or on GB-wide schemes.
However, this is incorrect. The Barnett formula has no legal force, and, in any case, is calculated using England as a baseline. However, that won’t stop the SNP MPs making political hay with the issue, particularly as “the Vow” – the last minute promise by the three Unionist party leaders during the 2014 independence referendum – promised to codify the formula. They will argue this breaks the spirit, if not the letter of the vow.