The BBC is the content provider much of the time......
When was the last time you looked at the credits ?
Even on good old Radio 4 there are an ever increasing number of programmes that end "this was an
X production for Radio 4".
The Communications Act 2003 requires the BBC to independently commission the production of a
minimum of 25% of their programming. There is a 50% in-house production guarantee and then the rest is up for grabs ..... and its very unlikely the outside companies are only producing their minimum 25% as they will in all likelihood be a lot more competitive and a lot quicker at delivering the goods as they won't have the internal bureaucracy hoops to jump through.
By the time you remove the news, questiontime and all that jazz from the 50%, you're likely left with less than 25% of original innovative content being produced by the BBC themselves (mostly the big documentaries they're good at doing).
The BBC's internal capacity has also been reduced to align with the 50%, and they have publicly stated that they are committed to treating the independent 25% "as a floor and not as a ceiling".
Sure "50%" might be much of the time. But so is the large percentage of independent productions. And what percentage of your viewing is made up of BBC produced programming ?