Question: To which actor, was the man who starred with Ben Kingsley and Sherry Baines in Testimony, regarded as the natural successor ?

<P0-S0> Testimony: The Story of Shostakovich is a 1988 British musical drama film directed by Tony Palmer and starring Ben Kingsley, Sherry Baines and Robert Stephens. <P0-S1>  The film is based on the memoirs of Dmitri Shostakovich (1906–1975) as dictated in the book "Testimony" (edited by Solomon Volkov, ISBN  ) and filmed in Panavision. <P0-S2>  Some consider the book to be a fabrication. <SEP> <P1-S0> Sir Robert Graham Stephens (14 July 193112 November 1995) was a leading English actor in the early years of Britain's Royal National Theatre. <P1-S1>  He was one of the most respected actors of his generation and was at one time regarded as the natural successor to Laurence Olivier. <SEP> <P2-S0> The Action Congress of Nigeria (ACN), formerly known as Action Congress (AC), was a Nigerian political party formed via the merger of the Alliance for Democracy, the Justice Party, the Advance Congress of Democrats, and several other minor political parties in September 2006. <P2-S1>  The party controlled Lagos. <P2-S2>  It was regarded as a natural successor to the progressive politics more closely associated with the Action Group and Unity Party of Nigeria (UPN) led by Chief Obafemi Awolowo in the First and Second Republics respectively. <P2-S3>  However, criticism of the party's more pragmatic and less ideological political outlook associated with AG and UPN, has made many argue it was less of a worthy political heir. <P2-S4>  The Party had strong presence in the South West (5 Governors, 15 Senators and 6 State Houses), Mid-West (1 Governor) and North Central Regions (3 Senators). <P2-S5>  Lagos, Edo, Ekiti, Kogi, Ondo, Bauchi, Plateau, Niger, Adamawa, Oyo and Osun states by far accounts for majority of the party's presence and discernible power base. <SEP> <P3-S0> Cleaver is a metafictional film within a TV-series that serves as an important plot element toward the end of the HBO television drama series "The Sopranos". <P3-S1>  Although very little film material is actually shown in the series, its planning and development are discussed at large throughout multiple seasons of the show. <P3-S2>  The extent to which Sopranos character Christopher Moltisanti mixes confidential and personal information about the Soprano mob family into the story elements of Cleaver is the focal point throughout its development. <P3-S3>  After the project eventually materializes, Cleaver can be categorized as a direct-to-DVD mafia-slasher film, described alternately as ""Saw" meets "the Godfather II"", ""the Ring" meets "The Godfather"", and "a story about a young man who goes to pieces and then manages to pull himself together again". <P3-S4>  Several characters are credited for their involvement in the project. <P3-S5>  The screenplay was written by J. T. Dolan based on a story by Christopher Moltisanti, directed by Morgan Yam and produced by Carmine Lupertazzi, Jr. and Moltisanti. <P3-S6>  The film starred Jonathan LaPaglia as Michael "the Cleaver" and Daniel Baldwin as mob boss Salvatore ("Sally Boy"). <P3-S7>  Also starring as Sally-boy's key advisors are George Pogatsia as Frankie and Lenny Ligotti as Nicky. <P3-S8>  Moltisanti and Lupertazzi initially attempts to recruit Ben Kingsley to fill the role of the mafia don in "Luxury Lounge (6x07)," but Kingsley eventually turns down the part.