This is about being able to charge more for Saturday delivery like most other “premium” delivery companies as they sure as shit wont be cutting the hours that they expect the Posties to work.

Because second class has a decent service level, even now, its possible to time your parcel delivery for a Saturday reasonably accurately for a low(er) fee. Drop second class then push up the prices for 1st class parcels.

Then when they can, with a more friendly Ofcom, they will stop first class on a Saturday and switch to a proper Saturday delivery tariff.