David Cameron has condemned Rishi Sunak’s closest parliamentary aide, Craig Williams, for making a "very foolish" decision after he placed a bet on a July election three days before it was called. The Guardian revealed on Wednesday that Williams, who is standing for re-election in Montgomeryshire and Glyndŵr, placed a £100 bet with Ladbrokes on a July poll. David Cameron says Rishi Sunak aide’s bet on election date was ‘very foolish’