article

http://www.theguardian.com/media/2014/oct/06/bbc-iplayer-30-days-sherlock 

BBC iPlayer catch-up window extended to 30 days 

This article is about BBC making their programmes and radio shows available for a longer period of time of 30 days rather than 7 days. This is because shows like 'Sherlock' was the most viewed programme online in 2014 to date. This scheme has been put through in time for the popular autumn dramas such as 'Peaky Blinders'. 

• There are more than 7m requests for BBC iPlayer programming a day.
• The BBC said the Sherlock series three opener had received more than 3.6 million requests on the iPlayer.
• The move came as the BBC revealed that Sherlock’s return from the grave is the most popular show on the iPlayer so far this year. 

I would say this is a good idea for the BBC as the programmes aired on BBC channels are quite popular, so when the audience cannot watch the show as it comes on TV they do not have to miss out on anything, they also do not have to rush to watch the programme before it goes as they have a month to watch it.