For information on the UK transport figures, just look at
www.statistics.gov.uk and follow the pointers to
transport.
Head Turner is just a little off-beam in thinking there are no figures for coaches; there
are tables for the total casualties in coaches, admittedly mixed in with buses and goods vehicles, as well as for cars, motorcycles, pedal cycles and people who walked. 51% of road deaths in 2002 happened to people in cars, which make cars look dangerous.
You can also find the casualty rate expressed per thousand million vehicle kilometres, and when it's expressed that way using a motorbike looks like suicide.
Doing the old shifty-shuffle with the figures means you can determine how many kilometres were travelled by each means of transport (the tables don't give it to you directly). Trouble is, I can't see 'kilometres travelled' figures for aircraft.
In any case, particularly for helicopters, you can argue that 'time of exposure' is as critical as 'distance travelled'. I mean, how likely was I to peg it when practising landings and take-offs, when I must have travelled all of 400 yards in one hour? As opposed to 'effects of controls', when we went 50 miles in that time?