 New-onset raised blood pressure BP affects about one in ten pregnancies. For some women, raised BP is an indication of pre-eclampsia: newly arising high blood pressure in pregnancy combined with protein leaking into the urine. After birth, womens BP remains elevated for a period of time, but in most cases returns to normal over 2-12 weeks. During this period medication needs to be adjusted to achieve the correct control. Research suggests that better BP control during this period is associated with improved long-term health outcomes. The investigators would like to find out whether home BP monitoring, and self-adjustment of medications according to an individualised protocol, could improve BP control and patient satisfaction. 