Us Brits might have conceived the idea of "received pronunciation" as a location-free English accent and exported it via international schools (though South Africa is the only place I can think of with non-trivial numbers of people whose accent is defined more by RP-norms than local norms), but in practice, very few people speak anything resembling the traditional RP, an accent most Britons would see as glaringly indicative of some combination of the speaker's private-schooling, age and pretentiousness. The southern (or subtly southern-ised) English accents that are most predominant in British run media are quite starkly different from traditional "RP" or "Oxford English" in terms of pronunciation and perceived social prestige.
There is no pan-English accent. There are plenty of projects to document this. Perhaps try something like Forvo: Type your word, and hear the different pronunciation via via speakers from different places in the world: http://forvo.com/languages/en/ for example the word 'English' http://forvo.com/word/english/#en
Yes. From a migrant country like Australia, if you flick on SBS TV News, you get the same phenomena. Fluent English, accented but neutral foreign tongue. You can hear the English equivalent on BBC World News with the announcers speaking RP. [0]
Is not pan english in that it is mostly attached to the US. But given the vast scope of the US media penetration its probably as close as you get.