S02E03 was not shown in the UK due to schedule conflicts. As a result they chose to show it as S03E03. Nevertheless, because time had passed and James Murray (Chief Superintendent) was replaced by Claire Skinner, they reshot his scenes. So, there are two versions of the episode. The "international" one with James Murray (S02E03) and the "UK" one (S03E03) with Claire Skinner.
Episode
S02E03 was not shown in the UK due to schedule conflicts. As a result they chose to show it as S03E03. Nevertheless, because time had passed and James Murray (Chief Superintendent) was replaced by Claire Skinner, they reshot his scenes. So, there are two versions of the episode. The "international" one with James Murray (S02E03) and the "UK" one (S03E03) with Claire Skinner.