Section 2 – Your Personal details Personal email address: Barclays Bank PLC is authorised by the Prudential Regulation Authority and Please complete this form in BLOCK CAPITALS using a BLACK ballpoint pen and SIGN it. EVERY​. How do I add a new / change the name of an existing signatory to my account? We will require a 'Change of Company Mandate' form to be completed. To obtain​. This form is designed to capture the citizenship and residency for tax purposes of the person entitled to the income and I authorise Barclays Bank PLC and Barclays Bank UK PLC Barclays is committed to protecting your personal data.