Evaluating a Mindfulness Booster Course for Healthcare Staff

The goal of this clinical trial is to learn if a mindfulness booster course can reduce stress in healthcare staff who have previously attended a mindfulness course. The main questions it aims to answer are: * Is a mindfulness booster course for healthcare staff effective at reducing their stress levels? * Are any benefits maintained for 8 weeks? Researchers will compare a mindfulness booster course with usual care to see if it helps to reduce stress. Participants will take part in either a mindfulness booster course or do what they usually do to look after their wellbeing. They will complete questionnaires at the beginning, middle and end of the study.