Who should attend? This course is for people wishing to renew an existing, valid First Aid at Work certificate. If your certificate has expired you are still able to attend this course, but the HSE recommends you attend the First Aid at Work (3 day course) if more than a month has elapsed since expiry. Please note that the requalification course is an intensive course with very little practice time and designed for people whose certificate is still in date. If you do decide to attend the requalification course you will need to work at the pace of the course.