My grandfather, a Somali, was a British Rifleman. He served in the British army in Africa. After the end of colonialism in Kenya, Somali British Riflemen were offered British citizenship or land in Kenya or Somaliland. Half took British citizenship and the other half took land in Kenya and Somaliland.
That is how Most Muslims ended up in the Uk. Colonization was started by the British not the other way around.
Like you say all the time, DON’T TRUST VERIFY.