Series 1 contains fairly mild slapstick violence, at times of higher tension the show still retains its comedic effect, series 2 is largely the same, however a couple of scenes towards the end of the series are quite strong, series 3 is quite a bit darker with its theme of gang related crime, some strong bloody violence and a quite bleak finale.
There is very bloody violence in Season 3 but 1 & 2 have mild scenes of violence
A man accidentally shoots himself in the head, his head is blown off and then explodes leaving blood and skin on the ground