British South Asian accent

This is a two-part question. A lot of British South Asian that are born and bred in the UK have a peculiar accent. It's very different than the familiar Indian accent too. So my question is...

Is there any other way to describe the accent? I found some describe it as ghetto but I'm not sure if it's the right word.

Secondly, what's the origin of the accent and what makes it different? Perhaps few examples with etymology would best explain.

A bit of a context, I'm British South Asian myself and I don't understand why so many speak the way they do. I understand not all speak that way and some even can switch between the two. However I'm unsure if the concept exists in other English speaking country.

Here is an example of the accent. https://www.youtube.com/watch?v=dCk6fSQ21rY

Solution 1:

In the nineteenth century large numbers of teachers were required to teach Received Pronunciation English to Indian Civil servants. Most of these teachers came from Wales. This, I think, is why many Indians, have a 'Welsh Lilt'. Bollywood actors are a good example of this, which may well be the reason why young people have unconsciously adopted it too.