Poor sod had probably just got off a RyanAir flight, I've often felt the need for intensive care after being on one of their flights
And as anyone who knows Stansted will tell you, from the terminal to the M11 is 5 minutes with lights and sirens, the roads to both Harlow and Chelmsford are poor in comparison to some "freeways" in other countries and an air ambulance will also get you to the treatment centre you really need very quickly.
Stansted ATC are very good with all emergency service helicopters (and very clear and helpful with VIP too) a landing in the coach park is clear of the approaches taxi-ways etc so no need for any flight to be inconvenienced.
SND