What does a SAR helo offer (apart from more space)
Assuming you mean a SAR Sea King (there are more modern ac in the UK SAR fleet)
NVG
Rule 5 inapplicable
Icing clearance (limited I grant you, but better than nothing, and see comment above about more modern ac).
Full two pilot IFR capability
zero/zero IFR clearance offshore (useful for landfalls to coastal airfields too)
24/7 availability
spare aircraft at each location
national centralised co-ordination
240 nm radius of action, range around 500 nm
Independent intercom system for medical team (Now I'm fishing, maybe Air Ambulances have that too)
spare seats for relatives far enough out of the way that they don't get hysterical at awkward moments
The entire resources of the MoD on call without consideration of cost (fishing quite hard)
Coffee boiler
Free chocolate
Crab, but no Sven (OK now I'm really fishing)
Or were you fishing, winchman?
Sven
still seeking employment