Dual has been going over here for years, it came in the same time as teletext was introduced, most of the spanish TV programming is now being passed over to TDT so if you haven't got a compatible TV you are going to get a shock in the non too distant future.  My TVs are all local bought but I am reliably assured that a TDT prepares set from the UK would work that same there as here.

As for the watching TV in the local language debate, well I have to agree that there is not much I would want to watch on TV over here, but even less that I would want to watch on TV over in the UK.  One of the things that sets the Brits apart from the locals here is that planning your day here doesn't start with "well there is your series at half six, then my programme at eight..."  God forbid anyone from the UK would wish to perpetuate that!  Yes watching TV in the local language helps, especially things like the news where you know what they are talking about and so have clues.  I would not advise anyone to but sky, except for the rugby and the cricket!