Justin Tomlinson, who voted for Brexit in 2016, said he had met with the business minister and representatives from Honda who had confirmed the plans.
"They were due to make a statement tomorrow morning, it's obviously broken early," Tomlinson, lawmaker for North Swindon, told Reuters.
"This is not Brexit-related. It is a reflection of the global market. They are seeking to consolidate production in Japan."
(Reporting by Alistair Smout, editing by Guy Faulconbridge)