The Natural Philosopher wrote:
MIG wrote:

At the time, the Emergency call was that someone had dislocated or
broken a leg. This - as was pointed out by the driver in his evidence -
is at least a potentially limb threatening event, and, if an artery has
been damaged, potentially life threatening. However since Colin
appeared not to even accept the fact that it was an emergency vehicle on
legitimate business, it might as easily been someone who had been
stabbed, or suffering a drug overdose, heart attack, or choking on
their vomit, (or someone else's), and the outcome would, it appears,
have been no different.

FWIW here is the link that Richard provided.

http://www.cambridge.gov.uk/public/c...11stds/3_0.pdf

A broken leg can be life-threatening... a friend of mine's brother was
knocked over by a car and suffered a compound fracture to his leg.

Some of the bone marrow escaped into his blood stream, blocked his lungs
and he died, even though the accident happened 1 mile from the County
(Buckinghamshire) hospital and he got to A&E and was x-rayed within the
hour.