I've done a lot of work with the BBC and know a number of people over in their IP/Networks department,
It's actually a very good place to work, not just in terms of the sorts of things they're doing - but in IP and Telecoms, it's generally seen as highly positive to have worked for a big media company such as the BBC/Sky/etc - so certainly a good move as far as career progression is concerned, there's a big future in it
If you're good at what you do - you could eventually land a good position at somewhere like Netflix or Amazon - and any of those roles is likely to blow anything else out the water, in terms of the job itself and the salary, (they pay enormous amounts)