Almost of all of these proposals (Lords abolition; constitutional convention & written constitution; devo-max-max) have been endorsed by Starmer at some point. The question is whether he has an overall vision for all of these fit together. https://www.theguardian.com/politics/2021/jan/31/keir-starmer-urged-to-back-radical-constitutional-reform-for-uk?CMP=Share_AndroidApp_Other
One notable omission (the report doesn't seem to be public) is electoral reform, which Starmer sort-of-vaguely endorsed during his leadership campaign, but which would have very radical consequences for Labour.
The report is here (h/t @DougGay). Most of the fun stuff was covered in The Guardian, but I note a proposal to have political screening of judges (who could strike down primary legislation) by the new Senate (the idea apparently came from Lord Hope).
https://www.scottishlabourleft.co.uk/uploads/6/4/8/1/6481256/remaking_the_british_state_for_the_many_not_the_few_final_report.pdf
https://www.scottishlabourleft.co.uk/uploads/6/4/8/1/6481256/remaking_the_british_state_for_the_many_not_the_few_final_report.pdf
Charmingly, there would be a "constitutional commitment to socialism", and privatization plans would be subject to JR by the (politically vetted) Supreme Court.
Rather surprisingly, the monarchy would be allowed to continue, although "all royal involvement in public affairs should be subject to a constitutional prohibition, with criminal sanction if contravened". All the "trappings" of monarchy would be abolished, as are all the titles.
As to devolution, "permanent constitutional status" for the devolved legislatures, and for the Greater London Authority, but not for the English regions, which should go down well.


A constitutional apology for the British Empire, and a constitutionally entrenched reparations fund, but with capped liabilities.
Acknowledgment that "there may be little or no appetite to reform the voting system in the House of Commons", but the new constitution is to be adopted by constitutional convention followed by a referendum.