You need to obtain a UK residence permit and then permanent residence.
To obtain permanent residence, you must have lived in the UK for at least 186 days in any 12 month period. The investor, their spouse and adult children must take an oral exam in English at the B1 level. They also need to successfully pass a test on their knowledge of the history and social structure of the UK.
After five years of residence in the UK, including one year as a permanent residence card holder, the investor and their family have the right to apply for citizenship, as long as they meet the following requirements:
Did not violate any of the laws of the country.
Have sufficient income not to depend on the state.
Have confirmed their knowledge of the language at the B1 level.
Have passed the naturalization test.
Swo allegiance to the monarch and confirmed their desire to live in the UK or keep in touch with the country.