Women with diabetes who are pregnant have a three- to fourfold increased risk of pre-eclampsia, which is further worsened if there is evidence of pre-existing hypertension or renal disease. This risk directly relates to glycaemic control at conception and in early pregnancy, whereby each 1% fall in HbA1C below 20 weeks’ gestation reduces the risk by 40% (Nelson-Piercy, 2010). Studies have shown that a daily dose of 75 mg of aspirin can reduce the occurrence of pre-eclampsia. All women with diabetes are therefore advised to take aspirin daily from 12 weeks until delivery (NICE, 2010b).