Media reporting of drugs death

Mark Reckons covered a lecture Professor David Nutt gave the other day and reports this snippet about the reporting of drug deaths in the media:-

1 in 265 deaths from paracetamol were reported by the media
1 in 48 deaths from diazepam
1 in 8 from cocaine
1 in 5 from heroin
for ecstasy the figure was 1 in 1

I'm wondering what the frequency of paracetamol deaths actually is, and where that information came from.