To become a detective in England, you generally need to complete the following steps:

1. Join the police force: To become a detective, you will need to join the police force and work your way up through the ranks. To be eligible to apply, you must be at least 18 years old and have no previous criminal convictions.

2. Complete initial training: Once you have been accepted into the police force, you will need to complete initial training. This will include both classroom-based and practical training on topics such as the law, police procedures, and investigative techniques.

3. Gain experience as a police officer: You will need to gain experience as a police officer before you can become a detective. This may involve working in a variety of roles and departments within the police force.

4. Apply for a detective role: When a detective role becomes available, you can apply for the position. You will need to demonstrate that you have the necessary skills and experience to be successful in the role.

5. Complete detective training: Once you have been selected for a detective role, you will need to complete further training specific to the role. This may include advanced investigative techniques and procedures.

6. Ongoing training and development: To remain a detective, you will need to engage in ongoing training and development to maintain your knowledge and skills.

Overall, becoming a detective in England requires a combination of education, work experience, and ongoing training and development within the police force.