In the 2016 letter from Mr Clark to Nissan's then chief executive Carlos Ghosn, he said the funding was contingent "on a positive decision by the Nissan board to allocate production of the Qashqai and X-Trail models to the Sunderland plant".
He added, however, that the company had "full confidence" in the Sunderland workforce and that it would continue to invest in Juke and Qashqai production there.
The factory in Sunderland, which was opened to great fanfare by former Prime Minister Margaret Thatcher in 1986, is Britain's largest with 442,000 cars built past year - nearly a third of total production in the country.
The company said it had made the decision "for business reasons", but added that "the continued uncertainty around the U.K.'s future relationship with the European Union is not helping companies like ours to plan for the future".
"Nissan has increased its investments in new powertrains and technology for its future European vehicles", the firm said. The UK was presented as a convenient and agreeable base for the companies' European operations.
"But we can not deny the inevitable role that Brexit plays here".
The news was due to be announced today, but Nissan was pushed to admit it early by the swirling rumours and panic over the weekend.
There will be no job losses as a result of this announcement, but the new jobs expected will not materialise.
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"It was likely to initially involve abandoning the X-Trail production plans which had been announced in the autumn of 2016".
It follows ongoing calls from the Society of Motor Manufacturers and Traders (SMMT) for the Government to avoid a no-deal Brexit.
Production of diesel cars was down by 22% to 561,000 a year ago.
The reported decision by Nissan comes just weeks after a triple jobs blow in the United Kingdom auto industry.
He said Unite remains "seriously concerned" that "the apprenticeships and additional jobs that come with future investment and which this community so desperately needs will be lost".
New-generation X-Trail crossover is seen during the presentation at Nissan's facility in St. Petersburg. The drop in investment only foreshadows what could happen, he said.
"For those reasons the company has made a decision to optimise our investments and concentrate production in Kyushu, instead of adding another production site". We are working hard to establish the truth behind current speculation and will be meeting with the company on Monday morning to establish both the facts and how such news has been released without a discussion with the union.