The U.K. promised Nissan up to £80 million ($104 million) of support and offered Brexit-related assurances to help secure a major investment from the Japanese carmaker in 2016, according to a well-guarded letter released Monday.

Nissan said in October 2016 that it would build the next generation of its Qashqai and X-Trail sport utility vehicles at its Sunderland plant in northern England, but on Sunday canceled plans to build the X-Trail as diesel sales drop in Europe.

The original decision, which would have created 740 new jobs, was hailed by Prime Minister Theresa May, who had newly taken office at the time, as a major boost to the U.K. as it began the process of extricating itself from the European Union.