Prospective studies of pre-conception diabetes care have confirmed its positive impact on the incidence of malformations by improving glycaemic control. Less information is available on the impact of pre-conception care on maternal and neonatal morbidity. This audit addresses its impact on timing and mode of delivery, incidence of macrosomia and rate of admission to neonatal unit care in addition to sociodemographic factors which may influence attendance at such a service. Attenders were more likely to be in a stable relationship and be non-smokers. They were more likely to book for antenatal care earlier and with a lower glycated haemoglobin. There were no early deliveries (i.e. < 30 weeks) or small for gestational age (SGA) babies in those who attended for pre-conception care and no neonatal deaths. Admission to NNU care was reduced by 50% in those who attended for pre-conception care. Although the rate of macrosomia was reduced, there was no impact on the Caesarian section rate. A pre-conception diabetes clinic may have a positive impact on neonatal morbidity.