As week four begins, the candidates are called to the Science Museum, where each team must select two innovative new products to sell to trade. The stakes are high, as both teams need to choose their product carefully and convince the inventors to allow them to represent their product. With products chosen and inventors happy with their team, it's time for the candidates to meet with some of the country's largest retailers. To add further pressure, each candidate is given their own individual order book with strict instructions to secure as many orders as possible - but with the tough economic climate, will they clock up enough orders to satisfy Lord Sugar? The Apprentice: You're Fired! can be seen on BBC2 at 10.00pm; Dara O Briain is joined by broadcaster and Guardian columnist Grace Dent. AKA Charlie Brooker's Screen Burn replacement. No pressure, Grace.