On Thursday Mackay appointed three former Watford colleagues to his backroom staff, with David Kerslake, Richard Collinge and Joe McBride all quitting Vicarage Road.
BBC: Cardiff snap up midfielder Cowie
2.
They'll be quizzing the Cabinet Secretary Sir Jeremy Heywood, and Sir Bob Kerslake, head of the home civil service on .....the future of the civil service.
BBC: Week ahead
3.
Running the home civil service is now a part-time post, held by Sir Bob Kerslake, who is also in charge of the department of local government.