Inclusion Criteria:  Adult patients ≥18 years Survival to intensive care / high dependency unit discharge following an admission of ≥24 hours Treated for COVID-19  Exclusion Criteria:  Unable to complete questionnaires Unable or unwilling to consent Unable to speak, understand or communicate in English Patients with diagnosed, pre-existing cognitive impairment (at the time of ICU admission) Patients without a fixed abode, at which postal questionnaires might be received, and who have no access to a personal email address.