I did watch it. They have exposed how some of the British Nationals were using the services of Fonseca to avoid paying taxes in the UK by declaring their income in tax heavens through the companies whose beneficial ownership was declared by some other individuals, excusing the real beneficiaries from paying the taxes.
Even though the program wasn't about the Sharifs, but it is important to point out according to the papers, Mariam is beneficial owner of two of the companies registered in BVI and not the trustee as claimed by her even today.
I must warn the program is highly technical, as i said before on the forum, this issue is well beyond the grasp of Pakistani journalists. They are idiots.