Ex-minister Rory Stewart said that (paraphrasing from memory) ministers don't know what they are doing because they don't stay in the job long enough. By the ti

Ex-minister Rory Stewart said that (paraphrasing from memory) ministers don't know what they are doing because they don't stay in the job long enough. By the time they get to the point they start to understand what they need to do they are either sacked or promoted to another ministry.