The number of HMRC investigations into serious tax fraud and avoidance has fallen to the lowest level in six years, new figures show.

Total investigations, known as Code of Practice eight and nine cases, fell from 1,091 in 2022-23 to 480 in 2023-24, according to the Financial Times.

Cop9 probes, which encompass the most serious tax cases such as the Hirst brothers and Bernie Ecclestone, fell from 669 in 2019-19 to 268 in 2023-24.