I have met and talked with both McColl and Donegan. Both Donegan's and McColl's natural spoken voices were in what I would call English, McColl more northern English than Donegan. McColl's singing voice varied, choosing either Scottish or English (being an actor) whereas Donegan stuck to his English accent even when singing 'Rock Island Line'.. We know where they were both born and raised, McColl born in England and raised in England and Donegan born in Scotland and raised in England so I really don't know what else is to be said.