I recently did my refresher course, this is a one day online to assess the theory side of things plus a one day practical at an assessment Centre to go over the hands on side of things. Whilst you get a certificate for the online part this is not the full certificate, you must do the one day online and the one day practical to renew your certificate. If you allow more than 3 years to elapse from your previous certificate before doing the refresher then you have to do the full course again