Just a post script re. the position of the MDU/RCN.
They offer worldwide protection, on a discretionary basis for acts of negligence by their members when acting as good samaritans.
The discretionary cover is indeed worldwide, but is depends on approval by the management board.
I'm not sure how this works in practice, and the risk management dept. were unable to discuss individual cases.
Interestingly, worldwide discretionary cover is only extended to individual paying members, and individuals who are part of a "group" scheme, eg practice nurses, are not covered for good samaritan acts, outside of work.
The RCN claim to extend their cover to good samaritan acts performed outside of work.
I can't be right all the time !