It's a good question aog.
Sad to say, it assumes the political establishment is geared to providing the best governance for the country - I guess we'd all like to think so.
Instead, it seems the system is geared to keep running the machine that the political classes (politicos, their teams and senior civil servants) are trained and experienced in.
I say, keep the Civil Servants (who actually are the ones who shape and enact policy) and use E.R.N.I.E to select a people's parliament that is demographically representative of the nation to vote on direction and implementation measures. Pay everyone £100k a year plus a pad in London for 4 years service.
It might be slow and clunky but it would be 'our' slow and clunky.
Of course the existing political classes will have lots of arguments for why it's a bad idea, but then they would wouldn't they?
Perhaps acquainting a few of them with the nearest lamp post and a length of rope would change their minds.