JE -
I was not questioning the fact that CHC fly their aircraft single-pilot in some operations - I was querying HC's description of these aircraft as "multi-crew aircraft". As I was trying to imply, if they are legally being flown by a single pilot, then they are by definition, "single-pilot aircraft" even if they are more commonly flown (for legislative reasons in a particular operating environment or due to customer requirements) with two crew.
I’m trying to do some research, to find out where CHC use Single pilot in multi crew aircraft
(although I see what you might mean, that one pilot + one crewman in EMS could be referred to as "single pilot in a multi crew aircraft", but I took the original query to refer to multi-pilot as opposed to multi-crew - if the original poster was a bit more open about why he wants the information, he might get more useful replies, sorry if I have confused the issue)