If you join the Labour Party you become one of the 630,000 members (as at late 2016) who are seriously committed to electing a Labour government. You get updates by email and post and a chance to take part in policy forums and internal elections. Join Labour here.
Or if you are a member of a Trade Union or other affiliated organisation, and want to stay in touch without formally joining the Labour Party yourself, you can become a supporter instead. Become a supporter here.