The Charity Commission has updated its short series of 5-minute guides for charity trustees, and you can see the series at https://beingacharitytrustee.campaign.gov.uk/
They cover:
- Delivering purpose
- Managing conflicts of interest
- Reporting information
- Safeguarding people
- Making decisions
- Managing finance
Each has links to other resources, so why not make them a short agenda item for your Board meetings?