It’s Thursday. That’s an aeon away for storm models. The Met Office is giving the appropriate messaging given the uncertainty bars around it. If (and hopefully this won’t happen) nearer the time it’s looking more likely to be a terrible storm, they will issue warnings.
Why would you think they’d try and keep something like this quiet? What do they have to gain? Won’t they look a bit silly if the whole south coast is flattened when they’ve predicted a nice call day?