It might help to look at the Welsh political landscape. Labour is in power but is permanently at risk of being replaced by the national-populist Plaid Cymru (like it happened in Scotland, where the Scottish National Party literally wiped the board). PC (like the SNP) supports UBI, so Lab has to coopt the policy. This also helps them attract LibDem voters (another pro-UBI party), whose votes are otherwise wasted (LDs can’t win in Wales). And it solidifies the covid-created Wales-Scotland axis against the UK government, currently dominated by unabashed “England-first” Conservatives (philosophically opposed to UBI, since it threatens to reduce employers’ power).

So the Welsh government has an interest in making the policy work for real, to keep them in power in the long term. The issue for them will be affordability.