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Curious detail: This was a UK choice, not an EU one. Other EU member states made it a requirement for their Parliament to agree. In the UK, the decision was taken to allow the government to override treaty scrutiny /1 https://twitter.com/johnredwood/status/1284951127507775489
Thus concerning CETA, Liam Fox as Secretary of State for International Trade decided to override the scrutiny reserve resolution of the Commons. Here’s the Chair of the European Scrutiny Committee /2
The situation thus became that the UK - through its own choice - had disempowered its Parliament, while Belgium - through its own choice - had empowered even its regional Parliaments https://www.bbc.com/news/world-europe-37749236
It is worth adding that even though the UK had opted to give its Parliament less of a voice than other Member States, EU Treaty Scrutiny was still stronger than treaty scrutiny under CRAG 2010. https://commonslibrary.parliament.uk/research-briefings/sn04693/
And the missing source: the inquiry into CETA treaty scrutiny http://data.parliament.uk/writtenevidence/committeeevidence.svc/evidencedocument/european-scrutiny-committee/parliamentary-scrutiny-of-eu-trade-deal-canadaeu-comprehensive-economic-and-trade-agreement-ceta/oral/42479.html
The author of the report (and one of the top experts on treaty scrutiny in the UK) was @Arabella_Law
