It' s an excellent set of programmes, all with some interest. Admittedly if I don't like the person I tend not to watch the show.
The Lenny Henry one was interesting, slavery being the main theme. He got really upset, rightly, with the thought of his ancestors working and dying in the fields and with no markers for the graves. This was doubly brought on when seeing a plaque to the death of the plantantation owner.
Later in the show he finds out that he is also blood related to the plantation owner, lots of puzzled looks and questions, great TV.