BBFC Age Rating for my Film

According to the BFI the majority of cinema goers were aged 15-24, making up 31% of the UK cinema audience. To tap into this I would definitely make my target audience in this age group as I would immediately be pitching to an area of interest.
The majority of the crime/thrillers I looked at for reference had an age rating of 15-18 with a couple of 12s. (Gone Girl 18, The Departed 18, The Girl with the Dragon Tattoo 18, Pulp Fiction 18, Fargo 18, Zodiac 15, The Snowtown Murders 18, Seven 18, The Bourne Identity 12, Collateral 12) I would aim to have my rating at a 15 because the idea of crime and murder will have more appeal to a slightly more mature audience who have the patience and intelligence to follow the plot line, especially with the disjointed formula. I am also going to have quite a violent, threatening plot which younger viewers may find disturbing so my age rating would have to be at least a 15.

According to the BBFC a film with a 15 certificate (that would apply to my film) may:
- Not involve discriminatory language or behaviour but may have homophobic, racist etc themes.
- Not show in detail dangerous behaviour which could be copied (e.g. hanging or self harm).
- Involve strong language and very strong depending on the circumstance (frequency, who used it etc).
- May involve strong threat or horror.
- Involve violence but may not dwell on the infliction of pain or injury. Not allowing strong gory images or sadistic violence.

I believe that my film would fit within these guidelines as it would involve violence and considerable threat but doesn't focus on discrimination, drugs or imitable behaviour as it follows a heroine who is helping solve a crime case having been directly involved with the serial killer. She, however, does not commit any dangerous behaviour herself and is generally a good character and would therefore not set bad examples to younger viewers. I would also not like to limit potential audiences for my film by making it an 18 and preventing younger viewers watching something that is actually appropriate for them.