You may have seen post around airsoft forums from the past by a person named clown, that's me. To start a society/AU team we would need 15 members including the 4 committee members, I am currently in contact with the union to decide (insurance-wise) if an airsoft club would be classed as an AU team or a society.
If the club was classed as a society there would be a Β£4 joining fee but the club could get funding (more than an AU team because AU teams are usually sponsored by a company), whereas if the club was classed as an AU team the joining fee would be Β£25. Regardless of the joining fee the union would give me excess and training to use the minibus for events.
Myself and 4 others that I know of want to set up a team.