notifications-admin/app/templates/views/agreement/_agreement-signed.html

<p>
  Your organisation ({{ owner }}) has already accepted the GOV.UK
  Notify data sharing and financial agreement. You can
  <a href="{{ url_for('main.download_agreement') }}">download a copy</a>.
</p>
<p>
  The agreement contains commercially sensitive information, so don’t share it more widely than you need to.
</p>