A PM or Finance Minister in this country does not have unilateral power.  There is not a single thing they can do to change policy without it being scrutinized and voted upon in Parliament, or the Upper Chambers etc.  This process is in itself a Check and Balance on misconduct. This is why they are not required by Law to put their assets in Trust or disclose their Taxes etc.  This is all journalistic sensationalism and essentially a non-issue.