In one episode, a man touches a statue's breast.

There is a naked man drunk and passed out on a lounge, baring his bottom.

Julian is a disgraced politician, who died in a sex scandal. This is mentioned throughout the series but in a comedic way.

Reference to masturbating in one episode

Sex is referenced

Reference to a threesome in one ep

theres some blood and violence

One person has an arrow in his neck

Someone is decapitated and you see his neck but is clearly fake

Several uses of "bloody hell" and "damn"

Pat says 'Naff off, you wazzock!'

Characters occasionally drink alcohol.

the plauge people are creepy and the ghosts may be at first

Right at the beginning (S1 E1) Alison is leaning out the window looking for something and is pushed by Julian (who can interact with physical objects) causing her head injury and almost killing her. This is what gives her the ability to interact with the ghosts.