I didnt have to do a formal interview with British Red Cross. I already knew someone, so I basically got the volunteer position. Try to network and get to know someone within the organization in order to get the job. It seems like you have to start at the bottom in order to advance in the organization.

Friendly, informal interview, with lots of room for asking questions. The process was casual and the the interviewer was very open about the role and what the expectations of the company's volunteers is.