Units contributing questionnaire and the areas of the questionnaire responded to by each unit
| Contributing unit | Groups involved |
| University Hospital Southampton | Paediatric, ACHD |
| Evelina Childrens Hospital/Guy’s & St Thomas’ NHS Foundation Trust | Paediatric, ACHD |
| Great Ormond Street Hospital for Children | Paediatric |
| Royal Brompton & Harefield NHS Foundation Trust | Paediatric, ACHD |
| Birmingham Children’s Hospital | Paediatric |
| University Hospital Birmingham | ACHD |
| University Hospitals Bristol NHS Foundation Trust | Paediatric, ACHD |
| Leeds Children’s Hospital/Leeds General Infirmary | Paediatric, ACHD |
| Royal Hospital for Children, Glasgow | Paediatric |
| Alder Hey Children’s Hospital/ North West Congenital Cardiac Services | Paediatric |
| Freeman Hospital, Newcastle upon Tyne | Paediatric, ACHD |
| East Midlands Congenital Heart Centre, Leicester | Paediatric, ACHD |
ACHD, adult congenital heart disease; NHS, National Health Service.