I would imagine that the BBC have to take the AELTC Wimbledon in-house produced feed.
Two other things of note -
1 - The BBC 'other games on other courts' match score graphics, doesn't look very 'Reith'
2 - We appear to have a high angle ariall tracking rail camera running at the back of the complex looking down from Centre Court towards the lower outside courts. (unless its a massive Technocrane with a very long boom arm)
The BBC always wanted a spidercam to run along the whole of the Wimbledon grounds (a la Roland Garros), but Wimbledon Council always refused them permission to have one, as the 3 massive anchoring towers would look 'ugly'. So they had to make do with the 'beautycam' up a crane from a car park outside of the tennis grounds.
My user name might look like Hatton Cross, but it's pronounced Throatwobbler Mangrove.