That is interesting eyeinthesky, in my experience if it is an emergency our crews do indeed land at the first opportunity. We have had, for example, medical diversions in to Nantes and Bournemouth destination London. On the other hand we have had near diversions but cancelled after the passenger rallied a bit.. .. .In Europe you would be hard pressed to justify the overflight of an airfield on the grounds that better medical treatment would be available at a larger airport.