The Start-up visa route has closed to new applicants. In order to still be eligible for the visa, individuals would need to already have their endorsement by 13 April 2023 and will have 3 months to apply for their visa.
New applicants looking to start a business in the UK should look into the new Innovator Founder route.
Existing Start up visa-holders may also be able to switch to the innovator founder route if they qualify. See Innovator Founder.