Individual Membership should be used by anyone not affiliated to a Local Group, but is also available to all
There is also a Family Membership option, where two or more Members may subscribe jointly
More information on Individual and Group Membership
Membership runs from the day of Subscription, and is valid for a year; Membership is renewed automatically, annually, but can be cancelled at any time. You do not need to be subscribed to Stripe to sign up; all you need is a valid credit card. Information on Stripe Security (somewhat technical)