Sport Relief Does Dragons' Den BBC2, 8pm

SPORT Relief celebrities walk up the famous stairs to accompany cash-hungry entrepreneurs in their bid for investment. Patrick Kielty lends his support to an improbable-sounding invention, the Sideways bike, while two sisters from Southampton hope the Dragons will see the potential in their bottom-toning prototype, ably demonstrated by Ruby Wax. Olympic champion James Cracknell lends a hand to young businessman Liam O'Reilly and his dancing troupe, and Greg Rusedski leaves his tennis racket behind to help two Irish entrepreneurs pitch their portable sports stadium aimed at kids. Finally, Jason Manford and Iwan Thomas both have to stand in front of the Dragons and pitch a spectacle stabilising attachment for sports caps and a sat nav for skiers.

Fat Man In A White Hat – BBC4, 9pm

IS FRENCH cuisine the best in the world? Or has it lost its magic? New Yorker magazine writer Bill Buford dons a white hat and works in a series of French kitchens to investigate whether Gallic grub is all it's cracked up to be. Can Bill survive in a restaurant where one of the signature dishes consists of garlic snails on a bed of crusty veal ears? And is sophisticated French food really worth the effort?

Battle For North America – BBC2, 9pm

MORE than two centuries ago, Britain and France fought a battle that would change the world. Now largely forgotten, the Battle of Quebec was once a story every schoolchild would have known. Dan Snow sets sail up the St Lawrence River following the route taken by the British to get a true idea of what the campaign and battle would have been like.