 To follow on from the work that suggests that those with above-average BP at six weeks postpartum have an approximately 30 increase in aortic stiffness, we are planning to conduct a sub-study to analyse markers of vascular risk in women from both groups. As it may be assumed that the baseline characteristics of the two groups are then similar, if we demonstrate a treatment effect from the intervention, then it will allow us to analyse the relationship between BP control in the postnatal period and markers of vascular risk to help determine if it is the severity of pathology or effectiveness of control that determines long term outcome. Women will consent to an optional extended visit at baseline and 3 months where measures of arterial stiffness and microvascular changes will be taken cardio-ankle vascular index, radial arterial tonometry and capillaroscopy. We will take a blood sample to measure circulating biomarkers relevant to cardiovascular health and pre-eclampsia. We aim to recruit a minimum of 15 women from each group. 