If you are a UK tax payer you can gift aid your membership. This does not cost you anything but the Guild can claim back 25% of the cost of your membership from HMRC. If you can do this it really helps us to keep the membership fees as low as we can for everyone.
As you join the Guild, or renew your membership, you will be asked whether you are able to Gift Aid your membership. If you are, you will be asked to fill in a second form for HMRC. There is a link to the form in the 'Thank you' message that you will see after renewing or joining, there will also be a link in the email that is sent you.
If you miss both of those links you can find the form here