TOKYO (Reuters) - Honda Motor said on Tuesday it will shut its only plant in Britain in 2021, a decision the Japanese car maker said was based on changes in the global market and not related to Brexit.The company will also stop making its Civic car model at its Turkey plant from 2021 but plans to continue its operations in the country, Honda Chief Executive Takahiro Hachigo told a news conference in Tokyo.The announcement comes a day after a British lawmaker said Honda will announce the closure..