Regardless of what the Prime Minister had or had not asked him to do, on establishing that there were unanswered questions about the incident, Sir Jeremy should have advised the Prime Minister that these questions required further investigation and therefore a wider inquiry.
The events leading to the resignation of the Government Chief Whip again demonstrate that the Cabinet Secretary is not the appropriate person to investigate allegations of ministerial misconduct.
His role is limited; there is already intense pressure on his time and attention; and his role as impartial investigator may conflict with his primary role, which is to support the daily work of the Prime Minister and the Government as a whole.
More top news
The Duke and Duchess of Cambridge met young people who have battled mental health issues on Saturday.
Former Chancellor Lord Geoffrey Howe was Margaret Thatcher's longest-serving Cabinet minister, also taking on the role of Foreign Secretary.
Lord Geoffrey Howe is known by many for his resignation speech which was seen as the catalyst which destroyed Margaret Thatcher.