| UPDATED: 08:00, Sun, Feb 21, 2021 Link copied Sign up for FREE now and never miss the top politics stories again SUBSCRIBE Invalid email When you subscribe we will use the information you provide to send you these newsletters. Sometimes they'll include recommendations for other related newsletters or services we offer. Our Privacy Notice explains more about how we use your data, and your rights. You can unsubscribe at any time. Sir Ivan Rogers, who was the Permanent Representative to the EU between 2013 and 2017, said Lord Frost's appointment to Boris Johnson's Cabinet shows Brexit is a permanent negotiation between Britain and the EU. He also warned the UK could be set for "spiky" relations with Brussels going forward.