Irish Dopers: Is Colin Farrell's accent totally fake?

Howzit goin’ n’all n’anywayz?

I heard him on Marianne Finnucane’s radio show, a little while ago and he referred to someone as “acting a bit of a bollox” and then caught himself because he had forgotten that he was on national radio. So from that I infer:

His accent is genuine
He seems decent enough
Mrs Pergau fancies him