.... beat me to it!!!!
Jar-Ops 3 also specifies Min Crew for EMS:
(A) Day flight. The
minimum crew by day shall be one
pilot and one HEMS crew member.
This can be reduced to one pilot
only in exceptional circumstances.
(B) Night flight. The
minimum crew by night shall be
two pilots. However, one pilot and
one HEMS crew member may be
employed in specific geographical
areas defined by the operator in the
Operations Manual to the
satisfaction of the Authority.
Woolf