The chief executive of JPMorgan authorized on a massive £3 billion office complex in the UK capital in the wake of guarantees from government representatives about pro-business policies.
The financial institution, which together with another major bank disclosed significant expansion projects right after avoiding higher taxes in Chancellor Rachel Reeves's recent budget announcement, only gave final approval recently.
This authorization followed a meeting to New York by Varun Chandra, who held discussions with Jamie Dimon to offer guarantees about the business environment.
The engagement happened days before the chancellor announced £26bn in tax rises in a financial statement that spared financial institutions from higher levies, after intense lobbying from the financial sector.
"The project ... would probably not have been announced if this financial plan had been regarded as anti-prosperity."
On this week, JP Morgan revealed plans to construct a massive headquarters in the docklands area, which will function as its new UK headquarters and house the majority of its British workforce.
The company stressed that the investment would be contingent upon "favorable economic conditions in the UK".
The financial institution has projected that the development could bring substantial economic value to the national economy over the following six-year period.
Chancellor Rachel Reeves expressed enthusiasm about the development, calling it a "massive endorsement in the nation's financial future".
A insider knowledgeable about the development project noted that the decision to invest was "based on multiple factors" and that "uncertainty remained whether banks were going to be subject to additional levies before the budget".
Jamie Dimon remarked that the "British authorities' focus of business expansion has been a critical factor in influencing our this choice".
Goldman Sachs revealed that it would enlarge its UK regional presence and hire additional workers, in a initiative that would more than double its employee numbers in the UK's second biggest city.
The Treasury had considered raising the financial sector tax in the UK, as it considered methods to increase income after deciding against higher personal taxation, but finally concluded not to do so.
Financial institutions in the UK currently pay a 28% corporation tax rate, which is higher than the standard 25%, as well as a distinct tax on their UK balance sheets.