How do I delete items from my download queue?

Hi everyone,

I recently bought the first six episodes of a TV show before realising I should have just got the whole series. Now that I've bought the series I have those first six eps sitting in my download queue again but I don't want to download them (they are big files and I don't want to waste my mobile broadband data on duplicates). Is there a way I can delete them from the queue forever?

Thanks in advance...