Provides 'Massive Online Open Courses' (MOOCs)
FutureLearn is a UK based provider of online training and education. There are others, easily found by a search engine. However this is the only one I know personally and therefore can recommend. You can do any course for free (upgrades e.g. CPD certificates available). Most are designed to take a few weeks but you can dip in and out as you please. Below are a few examples to get you started but the site is huge so I'm sure you will find something of interest - and it might not be work related.
This is a very highly rated introductory course. . Takes about 4 weeks but you can dip in and out as you like. Lots of practical content and it is repeated fairly often so you should be able to sign up at time that suits you.
University of Reading
UNDERSTANDING DEPRESSION, ANXIETY AND CBT
My favourite course (!) because I put it together with colleagues at Reading University. It is an introduction to the topic for complete novices. it includes some of the theory behind CBT (e.g. cognitive biases) and includes lots of videos showing role play sessions, exercises, quizzes and an online forum
University of Cape Town
WHAT IS A MIND?
This 6 week course is put together by a neuropsychologist and considers the topic from a range of angles. It takes a multidisciplinary approach (psychology, philosophy, neuroscience) to problems including consciousness, intention and agency. I haven't done it so would love to hear your feedback.
University of Oxford
COGNITIVE THERAPY FOR LOW BACK PAIN
Approved by the BPS for CPD. Designed by psychologists and physiotherapists. The Back Skills Training (BeST) programme focuses on ‘undoing’ beliefs about low back pain, and provides skills to become more active, despite pain.