Replying on the (probably optimistic) assumption that you're actually interested.
The Raspberry Pi Foundation is a somewhat unusual charity, in that it derives the bulk of its funding from trading activities rather than through "shake the tin" fundraising. In this respect we resemble charities which run high-street retail businesses to supplement their charitable income. Once you reach a certain size, it is considered good practice to separate trading activities into another, generally wholly-owned, business entity, and to have substantially non-overlapping board membership between the charity and the trading entity. I resigned in order to reduce the overlap to a single person, Jack Lang, who chairs the boards of both entities; we subsequently added Louis Glass to the Foundation board, restoring it to the original complement of six people.
More detail in our public filings at Companies House (http://www.companieshouse.gov.uk/).