Whenever a domain other than a .co.uk is transferred or the details on the domain are changed, the registrar of the domain is required to verify these details are correct. They do this via sending an email to the registrant email address on the domain. Within this email is a verification link which must be clicked upon to confirm the details are correct. If the client does not click on this link within 15 days then their domain will be suspended and any services on it will be brought down. Thus it is vitally important that if you receive an email about verification from Fasthosts that you click on the link contained within!