The National Council for Voluntary Organisations has gathered much of its guidance for Boards into a new area it calls Board Basics and you can see it at https://www.ncvo.org.uk/help-and-guidance/governance/board-basics/.
To access the individual documents, templates and tools, you do need to be an NCVO member, but perhaps now is a good time to consider joining?
We have just renewed our membership, and you can see the benefits of membership at https://www.ncvo.org.uk/get-involved/join/