The following certificates can be obtained through the Jisc Certificate Service's web app, found in the App Centre here:
The service provides Extended Validation (EV) server certificates S/MIME end user for digitally signing emails for high, both of which offer users the highest possible assurance. Business/Organisation Validated (OV) and Wildcard (of OV type) certificates are also available.
-----
All certificates issued are SHA-256.
-----