From the Code of Conduct for Special Advisors
"Special advisers must not take public part in political controversy, through any form of statement whether in speeches or letters to the press"
"29 May Sir Mark Sedwill [Head of the Civil Service] gave the go ahead to a press conference held by Dominic Cummings in the Downing Street rose garden, he has told MPs."
"In a letter copied to SNP Westminster leader Ian Blackford and shadow Cabinet Office minister Rachel Reeves, the cabinet secretary said he believed it was “appropriate” for Cummings to explain his actions on government premises given the recent controversy over his conduct in his official role."
"It is unprecedented for a special adviser to give a press conference about their own conduct on Downing Street grounds."
"In his letters to the two MPs, Sedwill said the statement had been authorised by the prime minister under the special advisers’ code of conduct “given the continuing public interest in this matter.”
“As the event related to his conduct in his official role, I considered it appropriate for the No.10 press office to facilitate it on government premises,” he said."
"Sedwill was responding to letters sent by the two MPs, both sent on 23 May, raising concerns about Cummings’s conduct."
www.civilserviceworld.com/articles/news/sedwill-green-lit-no10-cummings-press-conference-lockdown-breach-allegations
Scotland's Chief Medical Officer did not offer a reasonable excuse for her weekends away.