In tonight's show Lulu introduces her special guests Dudley Moore and his Trio, Mama Cass, Les Dawson, Marmalade 'Cuddly' Dudley Moore is not only a comic but also one of Britain's best jazz pianists; as he demonstrates tonight. Comedy comes from Les Dawson, and the pop interest is represented by Mama Cass (one-time member of the Mamas and the Papas) and Marmalade. The Douglas Squires Dozen, Alyn Ainsworth and his Orchestra