How can I add Third Party Authority to my account?

If you are an existing customer and wish to add a third party to your account, please head to our Customer Forms page to find the third party application form, or click here to be directed straight to the form. Please note that this application form will need to be signed by both you and your third party, and can be returned to us via email to [email protected] or by post to One Ropemaker Street, London, EC2Y 9AW.