You can't run for a Board position or vote if you're not a member, so please sign up! Do check the membership rules in the constitution. Particularly, if you are a minor under UK law you're very welcome but you will need parental consent.
The Association does not currently need to be registered with the Information Commissioner's Office, however it is obliged to follow the direction of UK privacy law and the Data Protection Act. If you have any concerns, contact us via our Twitter account.