People are always claiming that such-and-such a thing has been 'banned' by somebody or other, but they never seem to be able to produce a shred of evidence. Such claims, though widely believed, are usually just old wives' tales; 'modern myths' if you prefer. I would be astonished if the BBC had ever 'banned' Dougie MacLean's innocuous song, though its adoption as a campaign song by the SNP may well have meant that it wasn't played much on air during elections. The BBC has a statutory duty to be politically neutral, and would have to avoid appearing to favour one party over another.

The comment 'Robert Andrew Jaffray' quoted was copied from a pseudonymous post to 'Yahoo Answers' (Phillipines branch, apparently) made by somebody who (in that particular case) didn't know what they were talking about. It may be that Robert didn't read much of this discussion before posting to it; but he certainly isn't alone in that, unfortunately. The internet is the most effective way of spreading misinformation ever devised: 'I got this off the web' is usually best read as 'Ignore the following'.