在7月1日发布的最新指导文件的第13页,明文规定无法拿到 employment reference 的情况下,才可以使用经过公证的第三方声明,可以是由同事撰写的: If you are unable to obtain an employment reference on a company letterhead from your employer, a third party official Statutory Declaration or Affidavit written by a work colleague may be considered.
A Statutory Declaration or Affidavit is a legally written statement declared to be true in the presence of an authorised witness and signed, for example - a Notary Public.