212man,
Quite apart from any local requirements to do this, the operators of G reg a/c would prefer to get them off the G reg in order to use 'overseas' operating practices, rather than be bound by UK rules. I'm thinking of Flight Time and Duty limits, weather minimums etc.
Why is that ol' buddy?
Are you saying the UK rules are onerous and interfere with one making a living? I should think with all the suggestions the UK rules promote safety, the oil companies would embrace the UK standard around the world.
Why are the G-registered...thereby meaning the UK operators so quick to ditch their home grown set of rules whenever possible?