Where ‘Yes, Minister' was once the phrase of choice we are now hearing discord, with both sides resorting to public criticism of the other. 

It may have been an option once, but it is now no longer possible to paper over the cracks as the latest spat between ministers and mandarins confirms that their relationship is at an all-time low. 

There are some specific reasons for the latest breakdown: for example, it is clear that a 30%  reduction in the number of senior civil servants has cut deep into Whitehall's capacity, capability and morale.  Yet, the problems underlying the recent outbreak of verbal hostilities have been brewing for many years.