What Iain reports here shows that the BBC, a public service broadcaster with a duty to be politically balanced, is in fact a propaganda outlet. The researcher called him to be on the show, asked what he would say and then didn't call back. Instead, she tracked down a Conservative who would say what she wanted to hear and put him on instead.
Both the researcher and her editor should, at the least, be fired. It is is time to close the BBC, an organisation which has lost sight of its objectives.