@Walter Hinteler,
Lord Keen of Elie, the advocate general for Scotland (effectively the UK’s attorney general for Scotland - its most senior adviser on Scots law) is the fourth person to resign from government or a Conservative party position over the internal market bill.
(The others are: Sir Jonathan Jones, who was head of the government’s legal department; Rehman Chishti MP, who was the PM’s envoy on freedom of religion; and David Melding, who was shadow counsel general in the Welsh parliament.)