Interesting read, the British Japanese Society spokeman was on R4 earlier, said the trust had gone out of the relationship due to Brexit.
But while there are specific reasons behind each individual business decision, analysts said the spectre of Brexit was haunting Japanese firms across the board.
"Honda seems to have been preparing for this for a long time. Then Brexit happened, which might have pushed the company to make the decision now," said Seiji Sugiura, analyst at Tokai Tokyo Research Institute.
Both Sugiura and Satoru Takada, an auto analyst at TIW research firm based in Tokyo, noted that Honda had been debating what to do with the Swindon plant for some time.
"It has struggled in recent years. Then came Brexit," said Takada.
Many of these firms said Brexit wasn't the only factor in their decision but it played a part.
"What are the reasons for this pullout? One of them is distrust in Britain itself - its economy, politics and society are in disarray," said Yosuku Tsuchida, researcher at Mitsubishi UFJ Research and Consulting.
"It's a country risk." Tsuchida predicted that other firms using Britain as a base for continental Europe would consider pulling out.