The country’s tax watchdog is investigating current and former PwC partners for potential code breaches, prolonging the firm’s pain from its long-running scandal over the leaking of government information.

The number of individuals and the nature of the Tax Practitioners Board’s inquiries are unclear, but the new probes are expected to be completed by next year. The regulator is also investigating senior figures from other major firms, according to people not authorised to discuss ongoing inquiries.