With the gang attempting to flee under cover of darkness, shots are fired, including two from Crawford. At least one of these apparently hits and kills the target in the dark, the truth of which only comes to light later during the investigation that is quickly launched back at Dock Green police station. All officers are quizzed and re-quizzed by a senior external CID officer, going over the rights and wrongs of each step, looking for accountability. Everyone involved is left in no doubt as to the consequences of their actions, should they prove to be truthfully theirs. In retrospect, the process can be seen as primitive compared to the in-depth procedural investigations of the 21st century but was rarely touched on in contemporary productions. The detail ensured that neither characters nor viewers could be completely sure about the outcome, ensuring gripping television drama. By the final years of the series in the 1970s, Warner was getting elderly and looking increasingly implausible in uniform. He had increasing difficulty moving about, which was helped slightly by a treatment involving bee stings. When it became known that the 1976 series of eight episodes would be the last, some changes saw familiar faces including long-standing and popular cast member Peter Byrne leave, bringing in some new blood. The final series was shown in 1976 when Warner was 80 and the producers saw the opportunity to make some changes to the format. George Dixon was shown as retired from the police and being re-employed as a civilian as the collator, a temporary appointment which allowed him to train up whoever would be the next permanent collator. The introductory monologue and winding-up speech continued to be delivered by George Dixon, now out of uniform and behind his collator's desk. There was an increase in action whilst retaining detailed storytelling with Dixon's values at the core. The last series of eight episodes ended on Saturday 1 May 1976 with "Reunion", with Dixon retiring completely from Dock Green. Lord Willis said, "I knew it had to come to an end sometime and I thought something was in the wind. They usually renew my Dock Green contract in February and it hasn't been renewed this time". There were thoughts about continuing with the current cast using the revamped format, though any continuation would have been under a different title. Any ideas and plans were never seriously followed up and after 21 years of "Dixon of Dock Green", with its lead character out of the picture, the series came to a natural end. Over the two-decades-plus that Dixon was broadcast, it came in for increasing criticism, especially in its later years.