Yeah should be ok from a legal perspective, benefit fraud not really anything for UK govt to be concerned about. Just if Dave would be happy on the other side of the world while his mrs and kids are at home. Hope he stays and would be gutted if he went but wouldn't blame him one iota if he did.
Again I know nothing about this but if anything it's not her getting into the Uk that concerns me more her getting out of Oz. Just guessing but if she gets a suspended sentence won't she have to stay there?