Number 10 special advisor Dominic Cummings leaves his residence in north London on May 26, 2020. British Prime Minister Boris Johnson's top adviser Domonic Cummings said yesterday he acted "reasonably and legally" despite mounting pressure on him to resign for allegedly breaking coronavirus lockdown rules. (Photo: AFP)

British Prime Minister Boris Johnson's government suffered its first resignation over the controversy surrounding senior aide Dominic Cummings' trip across country during coronavirus lockdown when Douglas Ross, a minister for Scotland, quit in protest on Tuesday.

"The reaction to this news shows that Mr Cummings' interpretation of the government advice was not shared by the vast majority of people who have done as the government asked," Ross said in a Twitter statement announcing his departure from government.