As a membership organisation we take the security of your data seriously and as such we have upgraded our systems to meet modern security standards. The legacy systems had reached end-of-life and could no longer be supported. These upgrades mean you willno longer use your membership number and PIN to log into Catalyst or our electronic resources.

From now on, in order to access the full range of electronic resources and catalogue features you will need to sign up to the new Members Sign In service. This will allow access to all of our online resources with one set of account credentials.

  • From the London Library website, click on the Search the Catalogue link in the top right corner which takes you to the Catalyst home page.


  • To begin the sign up process click on sign in on the top right of the Catalyst home page


  • Then click the red sign up now button

Catalyst Sign In

  • Enter your 5-digit Membership Number and email address.It is important that you enter your email address using only lowercase characters.
  • Institutional Representatives will need to sign up to the new single sign on service using their 5-digit membership number and the email address they registered with the Library. Once you have created a unique password you and your Nominee(s) need to use this email address and password combination to sign in on subsequent occasions.
  • Then click the blue send verification code button.


  • Enter the code that was emailed to you and click verify code


  • When your code has been verified you can continue to set your own password
  • This needs to be at least 8 characters in length and could take the form of a passphrase, three unlinked words that are memorable and meaningful to you but to no one else (for example, redbracketscissors). You do not need to include any numbers, capitals or punctuation unless you wish to.


  • Click create
  • The signup is now complete and in the future you should use this email and password combination to log into the Library’s electronic services.
  • If you forget your password, you can use the Forgot your password? option on the sign in page to reset it.


  • If you have any problems with the sign up process, please contact This email address is being protected from spambots. You need JavaScript enabled to view it.
  • Please note, if you are experience a 'Log in failed' message please ensure you have removed any capital letters from your email address.