We would be rating out film a 12.
12 Rating is:
Suitable for 12 years and over. No-one younger than 12 may see a ‘12A’ film in a cinema unless accompanied by an adult. No-one younger than 12 may rent or buy a ‘12’ rated video or DVD. Responsibility for allowing under 12s to view lies with the accompanying or supervising adult.

Theme: Mature themes are acceptable, but their treament must be suitable for young teenagers.
Violence: Violence must not dwell on detail. There should be no emphasis on injuries or blood. Sexual violence may only be implied or briefly and discreetly indicated.
Imitable techniques: Dangerous techniques (eg combat, hanging, suicide and self-harming) should not dwell on imitable detail or appear pain or harm free. Easily accessible weapons should not be glamorised.
Horror: Sustained moderate threat and menace are permitted. Occasional gory moments only.

Our film is rated as a 12 because there's a reaccuring theme of death that may disturb young children.