Take a look at the STEM Learning site for your CPD. Keep a look out for free- on-line training, you can enrol on to local courses or on to a residential.
STEM Learning is the UK’s largest provider of education and careers support in science, technology, engineering and mathematics (STEM).
https://www.stem.org.uk/online-cpd
https://www.stem.org.uk/residential-cpd
This link is especially designed for Supply Teachers
https://www.stem.org.uk/sites/default/files/pages/downloads/Supply-agency-flyer-for-online-CPD.pdf