The rule, which began a phased rollout two years ago, gives families formalised, 24/7 access to a second opinion and is now advertised throughout hospitals Sign up for our free Health Check email to receive exclusive analysis on the week in health Get our free Health Check email Get our free Health Check email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice More than 1,500 NHS staff have invoked Martha’s Rule within its