Big Four examines the activities, performance, and strategic direction of Deloitte, PwC, EY, and KPMG — the firms that dominate the UK accountancy landscape. Covering leadership changes, audit reform, financial results, and market positioning, this section offers in-depth reporting on how these global firms influence regulation, competition, and professional standards. Accountancy Today’s Big Four coverage delivers insights into their operational strategies, service innovation, and the broader impact on the UK’s accounting and advisory market.