You advise me to go and look at their website (because they don't have any policies that stick in your mind enough that you can just type a couple instead), while simultaneously telling me that that would be a waste of time because obviously they haven't announced anything "solid" yet.
So which is it? Does Starmer have "responsible capitalist" policies that make him the rightful heir to Blairism, or does he not because he's keeping his powder dry till closer to the election? You can't have it both ways.
Basically they have said nothing to indicate they intend to pursue even the modest kind of centre-left social democracy we're talking about, and plenty to indicate the opposite - like a commitment not to raise corporation tax, to oppose wealth taxes, like abandoning ALL the pledges Starmer made about nationalisation etc. when running for the leadership.
I'm just taking them at their word. You seem intent on putting words into their mouth and insisting that one day they will announce the platform to confirm they are what you're already convinced yourself they are.