Two days after working at the 47th G7 summit in Cornwall on 13 June 2021, Marr says that he felt as if he was getting a mild summer cold—sneezing, sore throat, slight headache. Marr had had the recommended two doses of vaccine long before and said he felt "invulnerable"; he took two lateral-flow tests for covid as a precaution (this was during the COVID-19 pandemic in the UK), and continued working as usual when they gave a negative result. However, a later PCR test was positive, and Marr self-isolated (Nick Robinson stood in for him at the BBC). He later felt seriously ill, with a high temperature, muscle ache, the shakes, a bad headache, flu-like cold symptoms, total loss of sense of smell. By the time his 10-day quarantine ended he had recovered completely.