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Yesterday we heard part of the shocking testimony of a man who says he was the victim of historical sex abuse, forty years ago.

From the allegations about the Labour politician Greville Janner, detailed claims about the Liberal MP Cyril Smith and rumours of a cover up about a sex ring involving Conservative politicians, stories of abuse have been dominating the headlines. In February the Government announced that Justice Lowell Goddard will chair the Independent Inquiry into Child Sex Abuse to carry out an "exhaustive and critical" inquiry into these and other claims.

But their very nature - with the passage of time and lack of corroborating evidence - means that the process both for those who claim to have suffered abuse and for their alleged attackers can seem inconclusive.

Our reporter Becky Milligan is examining how difficult it can be to get to the truth of what happened forty years ago. Today we'll bring you the second part of David's Story - and you'll hear about the parties he attended with military figures and politicians and the abuse of children that he witnessed. Because of the adult nature of the subject, you may find parts of her report distressing.