What on earth is a British accent?

We've seen in the press over the last few days reports of a survey which states that around the world a 'British' accent is considered the 'most dateable' and the sexiest.

But what on earth is a British accent? I am English - I don't talk with any element of a Scottish, Welsh, or Northern Irish accent. I have never heard anyone speak where I could identify accents from all of these together. We all speak English in our own ways, and sound different from each other, sometimes not much but different nevertheless, and where there is no trace of an accent, it has to be said the language is truthfully English english, and others will not wish to own it. What do the Scots, Welsh and Northern Irish people think of the report?

For me the difficulty here with the authors is that for politically correct reasons they have probably said British because they dare not say English, because there would be an outcry from everywhere else, or maybe they do not understand the country. It is a common phenomenon.

Maybe they could explain, but I venture that is what they mean because overwhelmingly the people of the rest of the world hear English english more than any other.