BMC
The BMC have a lot of resources for supporting affiliated clubs.
Webinars
The BMC run webinars that are "designed for the officers, leaders and volunteers within registered clubs." Forthcoming sessions are listed along with links to recordings of past sessions.
Drop-in Sessions
The BMC run drop-in sessions every two months for club committee members to "join us to chat about topics or ask questions that are important to you and the club you help to run". Unlike the webinars these are not recorded.