When clients say that they want an audit, quite often they mean an accurate set of accounts at the year-end.

For larger more complicated clients, audits can be very specific and include:

Statutory audit under the Companies Act
Charity audits
Audit of specific transactions including litigation support
UK Government grants
Bank covenants often support loans
Solicitors Accounts Rules audit complying with the Solicitors Regulation Authority (SRA)
Audits under the Financial Conduct Authority rules. These can be below the Companies Act audit threshold, so FCA-regulated companies and their advisors need to be aware
Other regulated audit work