There is a Membership Subscription renewable annually on 1st January.  First subscriptions paid after 1st October will be valid until 31st December of the following year.

Annual Subscription:

Individual (standard)   £25
Individual (in full-time education or unwaged) £15
Joint (2 adults at same address) £40
Family (2 adults and up to 3 children at same address) £50
Organisation (minimum) £150

Life Membership Subscriptions are also available:

Individual (standard) £250
Joint (2 adults at same address) £400