While I agree with the concerns about how much is manufactured in China now, the problem with the car industry is nothing to do with car components made there. It is with Chinese car manufacturers: Aiways, BYD, NIO, Omoda, GWM Ora, XPENG, who are all, already in the UK market or planning to enter it that we need to worry about. It is worth [pointing out that MG, originally a Brritidh brand has been owned by a Chinese company for over 10 years.
Unless manufacturers in the UK can build enough cars here to be economically successful, they need to be exporting to the EU, and as things stand at the moment the Brexit agreement leaves us in a dilemma, either find away of building batteries and other parts in the UK pdq or hand out transport industry over to the Chinese.
There is more to colonisation than gun boat diplomacy, it also follows trade if it enables you to get a stranglehold on a strategic sector of another countries economy.