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O’Sullivan joined Battersea in June 2024 after 21 years at Galliard Homes.
He was dismissed in May 2025 amid claims he raised whistleblowing concerns about his employer, a Malaysian-owned development company.
He alleges that he was dismissed following charges of gross misconduct after raising concerns of serious financial misreporting.
Since he was suspended, a number of employees have also lost their jobs or been suspended. O’Sullivan and various employees have the support of the GMB union in relation to these claims.
Battersea Power Station Development Limited is a wholly owned subsidiary of BPS Holding, a Jersey registered company owned 40% by Sime Darby; 40% by SP Setia Berhad and 20% by the Employees Provident Fund (the national pension fund of Malysia).
O’Sullivan’s case is that the effect of the financial misreporting has been to flatter the balance sheet of BPS Holdings.
After O’Sullivan reported his whistleblowing concerns in November 2024, he was excluded from the business.
Concerns identified by O’Sullivan were discussed at a Board meeting in London of both the Development Company and BPS Holdings on 16 December 2024. O’Sullivan contends he was excluded the next day by two of the executives who were the subject of his disclosures, before subsequently being suspended on 24 December 2024.
The case is ongoing in the London South Employment Tribunal and has been listed for final hearing in 2029.
O’Sullivan is represented by John Hayes of Constantine Law and Stefan Brochwicz-Lewinski of Nine Chambers in Manchester in relation to his claims.
Hayes said: “Don O’Sullivan’s claim will possibilly be one of London’s highest profile and most valuable whistleblowing claim because it involves one of London’s most respected developers taking on a case against an iconic London development, owned ultimately by the Malaysian state.”
A Battersea Power Station Development Company (BPSDC) spokesperson said: “We strongly deny and are robustly defending the unfounded allegations made by Mr O’Sullivan in the Employment Tribunal.
“There are no claims made by Mr O’Sullivan relating to Battersea Power Station Development Company’s (BPSDC) accounts.
“BPSDC manages the Battersea Power Station estate ultimately on behalf of Battersea Project Holding Company, the holding company of the 42-acre regeneration project.
“Battersea Project Holding Company appointed highly regarded forensic accountants to independently investigate historic claims. Whilst the two forensic accountants reports deal with confidential matters, the conclusion reached was that Mr O’Sullivan’s concerns were not borne out, no further investigation was warranted and accounting practices employed by Battersea Project Holding Company Limited adhere to international accounting standards. Its accounts have always been audited and signed off by PwC, one of the big four accounting firms.
“With the recent appointment of a master planner to shape the remaining 16 acres of the regeneration project, and with construction of two new Gehry-designed buildings set to commence in the coming months, Battersea Power Station is entering its next chapter and looking at how it can evolve the already thriving neighbourhood for the future needs of London and beyond.
“Adhering to the confidential nature of Employment Tribunal procedures, we cannot comment on this matter further at this time.”