The British Coaches Abroad Association is an unincorporated association.
An unincorporated association is an organisation that arises when two or more people come together for a particular purpose but decide not to use a formal structure like a company.
The rules of the association in a formal written constitution, see link below
Management: a management committee will be elected to run the organisation on behalf of the members.
Membership: the criteria or eligibility for becoming a member, how a person becomes a member and importantly, how membership ends.