Millions of people in England are living with undiagnosed high blood pressure, warns the NHS, which can prove to be a ‘silent killer’ if left untreated. People in the county aged 40 and over are being asked to come forward for a free blood pressure check after an expansion in the number of community pharmacies able to offer tests. The plea coincides with a national campaign by health officials being launched this week to find the ‘missing millions’ in England unknowingly living with the condition, that often has no symptoms. High blood pressure affects an estimated 32% of all adults however ap…