Referrals are typically made via the GP, Obstetrician or Midwife, and can be on an NHS or private basis. 
Enquiries are welcome to discuss referral and timing of scans
NHS or Private
John Simpson MD FRCP
Professor of Paediatric and Fetal Cardiology 
Fetal Cardiology Unit,
Dept of Congenital Heart Disease
Evelina London Children's Hospital
Guy's and St Thomas' NHS Foundation Trust
Lambeth Palace Road
London SE1 7EH
Tel: 020 7188 2308
Fax: 020 7188 2307