It is very doubtful, watching today's proceedings, whether the UK can still accurately be described as a "parliamentary democracy". It is, increasingly, an "executive democracy", in which the largest party doesn't just dominate Parlt, but actively removes it from decision-making.
Brexit has turbo-charged what @davidallengreen & Thomas Poole call "the Executive Power Project": the transfer of power & democratic legitimacy from Parliament to the largest party. This should alarm anyone who thinks that scrutiny, debate & pluralism are important to a democracy
As @Brigid_Fowler writes here, "The UK Parliament’s proceedings on the TCA will be a farce"; "an abdication of Parliament’s constitutional responsibilities to deliver proper scrutiny of the executive & of the law." https://www.hansardsociety.org.uk/blog/parliaments-role-in-scrutinising-the-uk-eu-trade-and-cooperation-agreement