Business insurance is sold as a package and bought as a list of separate decisions. Knowing which decisions are compulsory, which are demanded by somebody you work for, and which are genuinely yours to make is most of the work, and it is usually done in that order.
The one cover the law requires
Employers' liability is compulsory for almost every UK business that employs somebody, under legislation dating from 1969, and the certificate has to be available to employees. The duty is triggered by employing a person rather than by the size of the payroll, so a business with one part time member of staff is inside it. A handful of narrow exemptions exist, most commonly for companies whose only employee owns the majority of the shares, and those are worth checking against the current guidance rather than assumed.
The covers somebody else requires of you
After the law, the next set of decisions is made by clients, landlords, trade bodies and regulators. A commercial lease will normally require the tenant to insure or to reimburse the landlord's premium. A client contract will name a public liability limit. A professional body will set a minimum professional indemnity figure. None of these is optional in practice, and all of them are discoverable by reading the documents you have already signed rather than by guessing at what a business like yours usually buys.
The covers that are genuinely your call
What is left is a commercial judgement about what would actually hurt. Stock and equipment cover matters to a business with a workshop and not to a consultant with a laptop. Business interruption matters where income stops if the premises do. Cyber matters where a business holds customer data or cannot trade if its systems are down. The useful question is not what is available but what the business could not absorb from its own cash, because that is the line insurance is for.
Package policies, and where they stop fitting
Small business packages bundle liability with property and a handful of extensions, which is efficient and is why they are the default. They stop fitting when an activity falls outside the trade code the package was built for, when a limit is fixed too low to match a contract, or when the business does something the package silently excludes. A package is a starting point that suits most firms in a trade, not a statement that your firm is covered for what it actually does.
Questions people ask about insurance for business
What business insurance is legally required in the UK?
Employers' liability, once the business employs anybody. Motor insurance applies to vehicles used on the road. Everything else is required by contract, by a landlord or by a professional body rather than by law.
Does a sole trader with no staff need employers' liability?
Not if nobody works for the business. The duty is triggered by employing a person, and unpaid helpers and some family arrangements can count, so it is worth reading the current guidance.
Is a package policy enough for a small business?
It usually covers the common case for a trade. It stops fitting where an activity is outside the trade code, a limit is below a contract requirement, or an exclusion sits over something the business actually does.