Every firm in the catalogue, not just the headline names. Filter by what a firm does, how it is structured, and which metric you care about — then add or remove any firm and the chart, totals and table recompute. The ten firms this series covers in most depth are flagged ★.
Turnover converted to GBP at €/£ 0.85, $/£ 0.78 where filed in another currency. "Members" and "top earner" come only from LLPs' filed accounts; "staff" is average headcount where disclosed. Firms filing under the small-company exemption (e.g. Cebr) or as overseas/sub-brand entities (BDO, Deloitte, PwC, Grant Thornton, RSM economics arms, PA Consulting, E.CA, Fraser of Allander) disclose no turnover and several no headcount — they remain in the catalogue and the table, shown as “—”. Each firm's CH-derived facts are reconciled in the project ledger.