British Academy of Composers and Songwriters

It costs £70 a year to join the British Academy of Composers and Songwriters as an ordinary member. Here's a quote from their website:-

Membership of the Academy is open to anyone who is actively writing music.If the music you are writing today is to have any value in tomorrow’s world, the Academy needs your support in its continuing campaign to protect the value of copyright in an ever changing technological world. Equally, we need to continue our campaign to create a more favourable environment for today's music writers, whatever their area of music.We have two main categories of membership, dependant on where you are in your musical career. Members are emerging writers who have not yet become a member of any royalty collection society or who have recently joined one, such as the PRS. If you have just finished college, are composing as a hobby or have recently started to perform/write then this category of membership is for you.