With UK restaurants handing out discounts worth £35 million a year, Simon Rimmer calls on expert help to reveal how it's possible to eat out at a fraction of the price. He tracks down the best offers and proves that there are plenty of big chains willing to give away food and drink for free. Sophie Morgan and food critic Lisa Markwell visit a luxury hotel to find out how fine dining meals can be affordable. And - fat, skinny, skin-on - we all have strong opinions about chips. But which are the healthiest? Sophie finds out.