Hugh Grant was "hugely grumpy" about having to do his Prime Minister dancing
Curtis said, "a not nice memory is mainly Hugh and the dancing. He was HUGELY grumpy about it. He was so wanting his bit not to be fake; he wanted to feel as though he could be prime minister. He kept on putting it off, and he didn’t like the song – it was originally a Jackson 5 song, but we couldn’t get it – so he was hugely unhappy about it."
But when they did finally film the scene, on the final day, Grant did it well and was singing along with the words...