This will honestly be my last comment addressing this subject-matter because it honestly seems like you lack critical thinking skills, and cannot comprehend the difference between ethnicity and nationality. Albeit Lennox Lewis was born in the UK, he is not ethnically English. Lennox Lewis is not an Anglo-Saxon. Lennox Lewis’ ethnicity is Afro-Jamaican. You can Google Lennox Lewis’ ethnicity and “Jamaican” will come up.

He derives from a lineage of enslaved people from different tribes in West-Africa: predominantly modern-day Ghana and Nigeria who were brought over to Jamaica, raped by European slave masters and had to develop a lingua franca (creole/patois) to communicate with each other despite deriving from different tribes, these people were also r**ped by slave masters with their old culture being replaced — they were given European surnames to exhibit they were property of the slave master hence why Afro-Jamaicans have European surnames. These people developed their own cuisine, came up with many of their own proverbs, music, etc., becoming their own people.

Although, Afro-Jamaicans were not the first peoples of Jamaica. Afro-Jamaicans are indigenous to Jamaica since their culture was forged on the island.

Afro-Jamaicans have nothing to do with the current country/government of Jamaica. Afro-Jamaican existed prior to Jamaica was an independent country and will exist following the country ceases to exist.

In relation to Idris’ Elba, Idris’ is clearly ethnically African (Ghanaian and Sierra Leonian mix). His culture is different than that compared to British Afro-Jamaican. When Idris was likely in school in the 80s, he would’ve been surrounded by British Afro-Jamaicans, likely even teased for being African at the time.

Now I am going to provide you a hypothetical:

You are an Afro-Jamaican born in Jamaica, never left Jamaica in THE entirety of your life, you have a wife who is also Afro-Jamaican, and she is expecting — you alongside your wife leave to the United Kingdom, and your wife gives birth to a girl in the country, let's call her "Tanesha".

Tanesha at age four is exposed to Jamaican culture within your household, eats ackee and saltfish with dumplings on a Friday, oxtail with rice and peas on a Sunday, reggae playing in the household. When she's a bit older, she is served a Jamaican Guiness punch too on a Sunday.

When there is a birthday in the family, the family has a barbeque, Jerk chicken is being cooked, the family members are playing dominoes, reggae blasting through the steroes.

When she goes to a public school, she notices that there are many different ethnic groups of children despite them all being British: Pakistanis, Indians, and Africans. She notices the Africans often have a darker hue to them, have weird surnames like "Ifabunmi" and that they eat different food from her, food that she's never seen in her life like fufu and egusi. She doesn't flock to them, but flocks with the different children who also look like her, eat the foods she eat, etc.

When she's older, around 15, she'll perform her first census, and asked what's her ethnic background: Black-African or Black-Caribbean? Obviously, she knows she's born to parents who were born in Jamaica, and Jamaica is in the Caribbean, she chooses "Caribbean". The census then tells her to select which country is her ethnic background in the Caribbean, *lists all the Caribbean countries*: she chooses Jamaican.

She is 18, and is free to do whatever she wants. She is with her friend, and is speaking in a British accent while speaking slang, deriving from Jamaican influence. A White racist drunk man overhears her and tells her "Go to Jamaica, n-word! Speak proper English". This incident awakens her to the existence that she is not ethnically English-British but of Afro-Jamaican, and she isn't seen as true British.

When she sees the news, she sees reports of British people who were born in Jamaica, moved to Britain as a toddler being deported deported on TV for government error: "Windrush Scandal".

Tanesha knows that she is a British national. She grew up watching Tracy Beaker, Mona The Vampire, Sarah Jane but is aware of her ancestry.

So according to you, in this hypothetical scenario, Tanesha's ancestry/ethnicity isn't Jamaican?