This happened in the past, a lot of people bought the track 'Ding Dong the Witch is Dead' from the Wizard of Oz movie in the week Margaret Thatcher died, BBC refused to play it despite it hitting number one.

It does raise interesting discussion points about the role of places like the Beeb in censoring what is essentially a list of the 'most popular' tracks in a given week.

Luckily this specific case is a little more clear-cut, stations can just invoke impartiality rules due to the General Election being so close and get around having to play the track.

We have very strong regulations about political advertising in run up to elections in this country, such a track could easily fall under such regulation. I doubt any major organisation wants to take the risk.