Yup, the tech stuff can be local, and they obviously do have people stationed in some countries, but they clearly get people from London to these places pretty quickly. The guy fronting ip the Sky Tunisia reports is one of their main London studio presenters.
Whilst watching the Sky reports from Tunisia, I was just wondering how their TV crews get to these places so quickly. Ok, Tunisia isn't the hardest place to get to, but in just a few hours they have a top reporter (who was presumably in London), plus cameras, sound etc. - ok, the tech stuff...