As they were bound to fail. From the moment Boris Johnson, Nigel Farage and Michael Gove won the Brexit referendum in 2016 by promising we could inflict a shuddering change to our country without feeling pain, failure has been inevitable. The only wonder is that it has taken so long for the British charlatan style to die.
That does rather assume that the incompetence of the British state administration is predicated upon Brexit. A difficult claim to support I would think. It’s not as if previous, inside the EU, governments were noted for their ability now, is it?