It exists because the UK is not a democracy.

https://www.theguardian.com/uk/2013/jan/14/secret-papers-royals-veto-bills

https://makingsense.quora.com/Did-you-know-that-UK-s-equivalent-of-US-Senate-the-House-of-Lords-constitutes-of-800-unelected-appointed-for-life-ar

Moreover, this undemocratic set-up is run and protected by a host of upper-class elites.

https://makingsense.quora.com/Why-Does-The-British-Upper-Class-Despise-Yuri-Gagarin-Russians-And-Various-Other-Nations

The only democracy that exists in the UK is the one that exists in talk only.