Trustees have a great deal of responsibility and we owe it to them, and to your organisation, that they are well-equipped for their tasks.
The NCVO runs regular training courses on a wide range of topics, and their Trustee induction and refresher training might be just what you need. Prices start from just £65 and you can find out more at https://booking.ncvo.org.uk/event/sessions?id=Charity_trustee_induction_and_refresher_2_x_05_days2807717898.