On the day of Bishop Richard Williamson's arrival at Heathrow Airport, following controversy over his questioning of official 'Holocaust' history, BBC World Service hosted a debate on the subject: Why Shouldn't We Question The Holocaust?

Mainstay guests on the programme were Lady Renouf and Prof. Deborah Lipstadt. Click on the controls above to listen to the debate.

(Earlier the same day Lady Renouf appeared on BBC Radio 4's The World at One, where she was interviewed alongside Lord Janner - former Labour MP Greville Janner, vice president of the World Jewish Congress. Click here to listen to that programme.)

The response from contributors to the BBC World Service online discussion was interesting, even from some of Lady Renouf's opponents. Click here to view some of the online contributions from listeners.