Good sound answers. I agree with revolutionary, if you cannot be sure of getting to destination don't take the patient, having to land on in a field and trying to jack up land crew (possibly differnt amb. service area to boot) if v tricky and takes time. Cabin cools, medics start worrying, patient knows something isnt right etc etc. Being VFR narrows your options. HEMS could be called but you might then be pushing on into God knows what conditions and they are not really there to allow 30 minutes of grobbling around at low level at 40 kts.
Even if IFR you then have fuel considerations plus getting cabbie from airport to hospital arranged.
Leave patient in cosy hospital, go get coffee watch England v Scotland and wait for front to pass.