Certificates are surrendered in the Registry of Certificates in TESSA for different reasons:

You need a TESSA user account to surrender certificates. The Registering an account page explains how to set up an account.

Scheme Participants must surrender certificates to meet their obligations at the same time as they submit their Annual Statement. Voluntary surrenders can happen at any time.

The Scheme Administrator makes a decision whether to accept the surrender of certificates by Scheme Participants and others.