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Nick Pollard, the former head of Sky News, has delivered a report - commissioned by the ´óÏó´«Ã½ - looking at whether there were any failings in the corporation's management of the Newsnight investigation into allegations of sexual abuse by Jimmy Savile.

The programme did not broadcast its planned report last year, and weeks later ´óÏó´«Ã½ TV ran tributes to the late presenter - leading to accusations of a cover-up.

Here's the background to the crisis, which led to the resignation of the director general.

How did this come about?

How has it affected broadcasts?

What is the ´óÏó´«Ã½ editorial chain?

Why did ´óÏó´«Ã½ director general George Entwistle resign?

What are the findings of the two investigations into Newsnight?

What actions are being taken?

Why is this important?

What is the government's position?

Is this the first such crisis at the ´óÏó´«Ã½?