"Gotten" in British English is the archaic form of got. We haven't used gotten in modern British English for years, centuries possibly. To my ear it sounds affected. Most people have probably been aware that the archaic form gotten survived in North American English, and heard it used quite often through most of the 20th century. So why has it only quite recently come back into British English, particularly amongst young people?

They watch too much american TV. According to the papers in the recent Rillington Place they addressed the judge as "Your Honour" instead of "My Lord" and said "so help me god" when swearing on the bible, which we do not do here.

Twice has now been all but replaced by 'two-time' and I even heard Jeremy Vine say 'named for' instead of named after on the radio the other day.

I know language evolves but I hate this creeping Americanisation (if that's a word )

https://en.oxforddictionaries.com/definition/gotten

I've heard people say "math" instead of "maths", too.

I'm not young, don't watch loads of American TV ad I've used 'gotten' all of my life

It is the past tense of "gonna".

Ditto.

Thritto.

Quatto.

I think you must be quite unusual. In the past 50 years or so I don't recall hearing a single British person using gotten until very recently. It's the recent appearance of this word I'm remarking at.

Always got for me never gotten and also never use the other american term "guy" which seems to be the norm for some now.

Andy Gray used gotten all the time on Sky Sports dating back to the 1990s.

Out of the few replies you've received so far, 4 of us are 'quite unusual' by your definition.

I suggest that your premise is flawed.

Really! Perhaps he thought it sounded cool. You know, a bit like Cliff Richard thinks that speaking with a slightly strange transatlantic twang sounds cool.

I tend to agree with the English Dictionary's As past participles of get, got and gotten both date back to Middle English. The form gotten is not used in British English but is very common in North American English. I

I dursent know.

Yes, yes, yes isn't it just so frustrating?
My daughter insists on using the words, elevators, windshields and closets. It doesn't matter how many times I tell her she's not American....

my granny used to say 'I durn't know'

Oh, you've only got to suggest something on an Internet forum for half a dozen contrary Individuals to contest it. It's probably got a name, you know like Godwin's law.

ill gotten gains.

Either that or your premise is flawed. Definitely one or the other, I'm sure.

[Edit] Believe it or not, this thread topic has been started before on more than one occasion:

'gotten'??? (from 2007)
Ok to use the word 'gotten' if you are English? (from 2009)
British people using the term "gotten" (from 2011)

So it's not exactly a recent phenomenon.

Not unusual at all. I'm from South London and it's pretty commonly used round my way.
It's definitely not a new thing

I've decided that they just do it to be annoying.

Either that, or they're secret masochists who really do want to be slapped with a wet haddock (not that this is something that's happened yet, but it can only be a matter of time).

Really. Well, not in my experience. It's a bit like autumn and fall. By and large very few British English speakers say fall. Yet we've heard North Americans say fall for the best part of the last century, since American films and TV programmes were watched over here. But it would be noticeable if a significant number of British people started saying fall, as it is with the increased use of the word gotten.

Is it a regional thing? Ages ago I started a thread on here asking why some posters said "Mom" instead of "Mum", thinking it was an annoying creeping Americanism, only to be informed that in the Midlands, everyone said "Mom".

I don't think I've ever heard anyone say "Gotten" in real life; only on the TV.