Help needed to renumber a large block of episodes

Season 5 of Crown Court tt0140733 contains a "hole" in the episode numbering: after episode S5.E50 ∙ Pigmented Patter: Part 3 tt5147948 there is a gap (as if for episodes 5.51, 5.52 and 5.53) and then the next episode is S5.E54 ∙ Stranger in the Night: Part 1 tt1144611. I have searched various episode lists (Wikipedia, TheTVDB etc) and cannot find any evidence to support another episode being transmitted in this gap: those sites number the stories (consisting of three episode per story) consecutively from Pigmented Patter to Stranger in the Night. It looks as if the gap is an error. Can an admin please renumber the episodes so 5.54 becomes 5.51, 5.55 becomes 5.52, 5.56 becomes 5.53 and so as far as the end of Season 5 (5.90 -> 5.87, 5.91->5.88 and 5.92 .> 5.89). Many thanks.