If your business is a separate legal entity (e.g. a limited company or LLP), the business can claim up to £120,000 for its business account, and you can separately claim up to £120,000 in relation to a personal account you also held.
A general partnership is not treated as a separate legal entity and is limited to a single FSCS protection limit of £120,000 for all accounts held in the partnership's name.
If you run your business as a sole trader (e.g. Mrs Smith t/a Smith Motors), your business and personal accounts would be aggregated together, and you could only be able to claim up to £120,000 in total.
For more information about the FSCS protection please visit https://www.fscs.org.uk/making-a-claim/claims-process/small-business/