What certificate would our film be?

I think that our film would be a 12 because there would be issues with the male protagonist showing alcohol abuse and violence which many people are offended by however we will not show this to a large extent. Also there would be expressions and gestures used to imitate language. Between the main two protagonists there will be the portrayal of sexual activity only ranging to kissing without the detail of real sex. Even though there are parts of 15 in this film opening its not enough to make it a 15 as we aren't showing it to a real extent.