The correct statement about The New Model Unions is that they were formed in the 1850s. This means that option 1 is the correct answer.

Option 2, which states that The New Model Unions were formed in the 1880s, is incorrect. This contradicts the correct statement that they were formed in the 1850s.

Option 3 states that The New Model Unions comprised a Labour Party idea. This statement is not addressed in the given information, so it cannot be determined if it is correct or incorrect based on the provided information.

Option 4 states that The New Model Unions excluded women in the 1920s. This statement is not supported by the given information, which only talks about when the unions were formed. Therefore, it is incorrect to say that they excluded women in the 1920s.

In summary, only option 1 is correct - The New Model Unions were formed in the 1850s.