1) Economic Justice
Increase income tax for the top 5% of earners – ROWED BACK ON

In July, Shadow Minister Rachel Reeves refused to back Keir Starmer’s promise to increase tax on people earning over £80,000 – stating that the party needed to “reassess” the policy. https://twitter.com/bbcpolitics/status/1282238727784411136?s=21
In response to criticism over the party’s apparent backtracking, Keir Starmer’s spokesperson said the Labour leader still stood by his commitment to raise taxes on the top 5% of earners, but refused to confirm whether or not it would be included in the party’s next manifesto.
Starmer's spokesman said:

“Keir made those commitments during the leadership campaign, but we’re four years out from a general election and the next manifesto will set out our full tax policy at the time.”
Adding:

“Keir stands by the commitments he made during the leadership election, but in terms of our final tax plans they’ll be set out at the next election in the manifesto.”
Clamp Down on Tax Avoidance – QUESTIONS TO BE ANSWERED

In April it was revealed that one of Keir Starmer’s key election donors was Trevor Chinn – a multi-millionaire who not only opposes tax rises for the rich, has also defended tax avoidance measures.

https://citywire.co.uk/wealth-manager/news/call-not-to-hammer-the-super-rich-with-taxes/a315788/print?section=wealth-manager
No stepping back from our core principles – QUESTIONS TO BE ANSWERED

Given that the party already have rowed back on Keir Starmer’s key economic pledges, it is fair to say that Labour have stepped back from the core economic principles it held during Jeremy Corbyn’s leadership.
2) Social Justice
End Benefits Sanctions – UNCONFIRMED BUT LOOKS POSITIVE

Whilst Labour do not appear to have commited themselves to abolishing Benefit Sanctions entirely since April, the Shadow DWP Secretary has called on the Tories to extend the benefit sanctions suspension during the pandemic.
Invest in Services that Help Shift to a Preventation Approach – QUESTIONS TO BE ANSWERED

In June, Keir Starmer described the Black Lives Matter policy to “Defund The Police” – which calls for the reallocation of policing funding towards preventative measures – as “nonsense“.
Despite issuing an apology over a separate flippant comment he made during the same interview, the Labour leader has still not clarified his position on the reallocation of funds towards preventative measures in order to tackle crime.
Stand Up for Universal Services & the NHS – PLEDGE KEPT

Keir Starmer has repeatedly stood up for the NHS during the ongoing pandemic – saying that after the crisis had passed there would need to be a reckoning regarding pay towards our “underpaid and undervalued” NHS staff.
He also cites the NHS in his Conference speech - slamming the Tories' “underfunding of the NHS, the abandonment of social care and the lack of investment in prevention” as well as mentioning “properly funded universal public services” as a key priority. https://labour.org.uk/press/full-text-of-keir-starmers-speech-at-labour-connected/
3) Climate Justice
A Clean Air Act to tackle pollution locally – PLEDGE KEPT

Keir Starmer had been talking about introducing a Clean Air Act for years before he became Labour leader – and also reportedly reiterated his commitment to the policy at conference in September. https://www.endsreport.com/article/1694999/labour-party-conference-starmer-pledges-new-clean-air-act
4) Promote Peace & Human Rights
No more illegal wars – QUESTIONS TO BE ANSWERED

Starmer has not yet started any illegal wars.

However, one of his first moves as leader was to appoint John Healey as Shadow Defence Secretary. Healey consistently voted for the illegal Iraq War and against investigations into it.
Introduce a Prevention of Military Intervention Act and put human rights at the heart of foreign policy – BROKEN

In terms his pledge to put “human rights at the heart of foreign policy“, Starmer backtracked after ordering Labour MPs not to oppose the Overseas Operations Bill.
Review all UK arms sales and make us a force for international peace and justice – QUESTIONS TO BE ANSWERED

Since Starmer became leader in April, Labour have repeatedly called on the government to review arms sales. https://labour.org.uk/press/govt-resumes-sale-of-arms-to-saudi-arabia-thornberry-responds/
However, Starmer’s positions on the Overseas Operations Bill, on Kashmir, and on Israeli sanctions, are clearly contrary to his pledge to make the party a “force for international peace and justice“.
5) Common Ownership
Support common ownership of rail, mail, energy and water; – ROWED BACK ON

Shadow Foreign Secretary, Lisa Nandy, refused to back Starmer’s pledge to nationalise Rail, Mail, Energy and Water – stating public ownership was simply “one way” of doing things. https://twitter.com/siennamarla/status/1308330048324337665
In a question and answer session with the Confederation of British Industry (CBI), Starmer refused to commit to the party’s current policy of nationalising BT Openreach – instead simply declaring that Labour would be “pro-business” under his leadership. https://twitter.com/CBItweets/status/1323238544064847873?s=20
6) Defend Migrants’ Rights
An immigration system based on compassion and dignity – BROKEN

Keir Starmer faced a “revolt” of Labour members in August after he refused to defend migrants crossing the channel – with critics claiming he was “turning a blind eye” to desperate people. https://www.independent.co.uk/news/uk/politics/keir-starmer-channel-crossings-labour-revolt-refugees-migrants-a9682061.html
Rather than defending the rights of migrants to claim asylum in Britain – which is enshrined in the UN Refugee Convention – the Labour front bench merely criticsed the government’s “incompetence” in dealing with migrants arriving on Britain’s shores.
The soft-left Open Labour group called on Starmer to “join us in condemning the government, and campaigning for an immigration system that advances the rights of all working people“, whilst Momentum called on him to “end his silence on the scapegoating of refugees and migrants“.
7) Strengthen Workers’ Rights and Trade Unions
Leaked briefings also showed the leadership thought Teaching Unions were acting as a “barrier” to kids and their education, and described how sacked Shadow Education Secretary, Rebecca Long-Bailey, had failed to “stand up to the National Education Union“. https://morningstaronline.co.uk/article/editorial-labours-anti-union-briefings-show-starmer-out-touch
Given the overwhelming evidence, it’s fair to say that Keir Starmer has well and truly annihilated his promise to stand “shoulder to shoulder” with Trade Unions during the last seven months.
8) Radical Devolution of Power, Wealth and Opportunity
9) Equality
Pull down obstacles that limit opportunities and talent – BROKEN

In June, Keir Starmer dismissed the Black Lives Matter movement as simply “a moment” and said the organisation’s demand to reallocate police funding to preventative measures was “nonsense“. https://twitter.com/DawnButlerBrent/status/1277724273365471244?s=20
Despite Starmer repeatedly promising to take a “zero-tolerance” approach to antisemitism, he has so far refused to take action against two MPs – Barry Sheerman and Steve Reed – over clearly antisemitic comments, both of which broke the IHRA definition and the party's rulebook.
And less than a month later, Starmer failed to take action against Labour MP Barry Sheerman after he appeared to link two Jewish businessmen to "silver shekels".
10) Effective Opposition to the Tories
Forensic, effective opposition to the Tories in Parliament – BROKEN

Whilst Starmer has clearly been forensic in his approach, the Labour leader has encountered relentless criticism, from all sides of the political spectrum, for his astonishingly agreeable approach to opposition.
And, perhaps most damningly of all, Starmer was ripped to shreds by the entire cast of Gogglebox: https://twitter.com/BenJolly9/status/1309766414006398979?s=20
Unite our party – ABSOLUTELY OBLITERATED

Since becoming leader, it's undeniable that Starmer has done the very opposite of uniting the party.

Whilst they were clearly hugely divided for the whole of Jeremy Corbyn’s 5-year tenure, Starmer’s actions have only compounded things.
From the hugely controversial decision to sack his main leadership rival from the Shadow Cabinet, to ordering MPs to abstain on horrific Tory legislation, Starmer has consistently alienated both Labour members and MPs by pouring petrol on the flames of an already raging inferno.
Conclusion

Whilst it's clearly impossible to objectively measure some of Keir Starmer’s pledges due to the fact he's in opposition rather than in power, there's absolutely no question he has either broken or rowed back on a large proportion of his leadership promises already.
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