Periods of membership

New members can join either for 6 or 12 months. The 6-month period is only available as an initial trial membership, and is not available for Affiliated or Student members. At the end of 6 months, there is an option either to extend the period to 12 months by paying the difference in fee, or to take out a 12-month membership from that point, paying a full 12 months fee.