Under the UK’s points based immigration system, wealthy people can immigrate to the UK through investment under the Tier 1 (Investor) sub-category of Tier 1 if they have at least £2,000,000 to invest in the UK. UK Tier 1 (Investor) Visa is for non-European migrants who are willing to enter or stay in the United Kingdom.
You can come to the UK with a Tier 1 (Investor) visa for a maximum of 3 years and 4 months which is extendable to further 2 years visa. You may be able to apply for settlement (known as 'indefinite leave to remain') once you've been in the UK for 5 years. You are eligible to apply for ILR even after 2 or 3 years depending on the amount of investment you made in the UK.