Nigel Slater: Eating Together episode 6 - Noodles: Nigel's tour of modern British home cooking explores the flair and flamboyance of noodles, from his own rustic take on old-fashioned spaghetti bolognese to the German art of noodle making from scratch, which Steffi shows him using a traditional spaetzle board.      He finds a Spanish favourite, fideua, that's as exuberant as the lady who makes…