With reference to the recent issue with Lady Susan and Ngosi Fulani- at what stage does someone become British?

Sorry, forgot to add!

I was never more British than when I lived in the USA. Strangely, less so in the other countries I've lived in. I always felt far more foreign in the US.

Isn't it different for different people?

For some, it's being born here.

For some, it is having British parents, even though the child is born overseas (knew someone like this in the US. He regarded himself as half British).

For others, yes, it's getting citizenship. A friend of mine gained citizenship 2 years ago after living here for years. He is very happily and enthusiastically aquiring the 'lingo'.

I think for those that come here as children, they absorb it while at school. Although my DGS currently has our Southern accent, despite only every having lived in the NE of the UK.

Nationality is according to the link posted by Blossoming If you are British according to that link, you are British. It doesn't change the "reality" of anything. I have a nephew and niece who live abroad, they speak adequate English with a strong accent as they left the UK as very young children, if you met them you might think they had a different nationality, but they are British. What someone else thinks is of no consequence. I am rather struggling to understand what you are asking.

Our son has taken Spanish nationality (he has a Spanish wife and Spanish children). Taking Spanish nationality means that he gives up British nationality.
Is he no longer British at all?
I have no idea.

I have no further comment to make, I am not interested in an online argument.

This here is a spoof- to illustrate what I am saying. But it is very close to the everyday truth in RL

www.youtube.com/watch?v=crAv5ttax2I

Blossoming, that is the theory- the reality on the ground is VERY VERY different, Especially for those like Ngosi who happen ot look 'different', but for all those who acquired nationality as children, teenagers or young adults.

It’s all explained on the Gov.uk website link below.

www.gov.uk/types-of-british-nationality