The SST has an interview with Doreen Prebble and gives details of the marriage split-up.
I’m unconvinced that an MP’s affair is newsworthy, unless there are matters of public policy involves (such as with Lange-Pope). I also fail to understand why some affairs get reported on, while others do not.
Having said that, the Prebble affair has been pretty well known for a year or so. A real pity as almost everyone who has met Doreen Prebble says she is a lovely person, but as the proverb says, let him who is without sin cast the first stone.