Start with the right route
There is no separate UAE investor visa issued only to British citizens.
Your UK nationality does not itself determine the residence category. The appropriate route depends on why you are moving to the UAE, whether you own or invest in a UAE business, your shareholding or investment evidence, the emirate involved and whether you qualify for a longer-term residence category.
For an entrepreneur establishing or participating in a UAE company, relevant options can include a business-owner or partner residence route, Green Residency for eligible investors and business partners, or Golden Residency where the applicable investor or entrepreneur criteria are met.
Do not choose the visa before defining the business.
If your residency is connected to a new UAE company, the licence, jurisdiction, ownership structure, visa capacity and intended operations should be considered together before you commit to a setup package.