On WFH.io (https://www.wfh.io), we always try to link back to the employer's job posting. Job boards in the UK are mainly populated by recruiters, and it's not until after you submit your CV that you actually find out who's hiring. To me that seems completely ridiculous but is standard procedure here.

Also, if the job posting doesn't explicitly mention remote/WFH, then we try to avoid posting the job.