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"Macwhirter, who has recently been a vociferous critic of BBC Scotland, gave evidence critical of the station to the government's Scottish Broadcasting Commission, which last week delivered a highly praised report after a year-long study of broadcasting in Scotland.
Since giving his evidence, previously regular requests that he appear on the station's political programmes have dried up. Leaked emails suggest programme makers have been told not to use him and the broadcasting commission chairman Blair Jenkins has been told of the ban by BBC insiders."
"At the time of his submission, in May this year, Macwhirter regularly appeared on a variety of BBC Scotland shows every week.
That changed after his appearance on Good Morning Scotland (GMS), the weekday news programme, on July 28.
After the show, GMS editor Philip Wells sent his BBC colleagues an email which stated: "Folks - could you check with me before we use Iain Macwhirter on our programmes."
The Sunday Herald has been told that on the same day a senior editor at BBC Scotland informed producers not to use Macwhirter on any of his programmes.
On July 29, debriefing notes from that morning's GMS show say: "We won't use Iain Macwhirter for the forseeable - if u need to ask come and have a word."
Macwhirter has not been used at all by BBC Scotland since."