How To Start A Masonry Business In The United Kingdom
There are a few different steps to becoming a successful masonry business (concrete, stone, brick, tuckpointing, etc.). You may want to start here: How To Start A Masonry Business. You must do your own thorough research, as laws change regularly, and may vary depending on your locale. Here are some steps you may have to take (not necessarily in order) to start your masonry company, along with links to more information.
Getting started– The UK has a website about starting a business in the UK here: https://www.gov.uk/set-up-business
-Register your masonry business name.
Find out more about registering your masonry company name here:
https://www.gov.uk/choose-company-name
If you need help selecting a name for your masonry business: Choosing a Business Name and Masonry Business Name Ideas
-Select your business structure.
Find out more here: https://www.gov.uk/business-legal-structures
-Register your masonry business.
You can find out more about registering your masonry business with the UK here:
https://www.gov.uk/set-up-business-uk/register-your-business-in-the-uk
-Open a Business Account with your Bank.
You will need to open a separate bank account for your masonry business with your new business name.
-Find out about taxes, insurance, and fees and hire an accountant.
You may want to file your own taxes if you are a small company. As you grow, it will be easier to have an accountant do the work. More info about taxes here:
https://www.gov.uk/what-is-the-construction-industry-scheme
https://www.gov.uk/government/organisations/hm-revenue-customs
https://www.gov.uk/national-insurance/overview
-Get Liability Insurance.
Find an insurance agent that offers liability insurance. You may want to shop around, as prices and options can vary. 
-Worker’s Compensation.
The insurance agency that provided your liability insurance should be able to help with this. You don’t need Worker’s Compensation unless you have employees.
-Approvals.
Depending on the locale, you may need permission before commencing certain types of masonry jobs.
https://www.gov.uk/building-regulations-approval/when-you-need-approval