Re: Money issues
Whoa, hang on. ARM has not depended on or required British government investment. They've done very well as a strictly private endeavour, not needing public money at all. What did you want the government to do? Nationalise it?
It was not a lack of investment in ARM that caused Softbank to offer way over the odds for the company in 2016. Oh, and Softbank is not the sovereign nation of Japan. The Japanese did not buy ARM.
The only lawful way government can interfere in private enterprise is if there is some law that requires them to do so. A British company being owned (but otherwise staying as is) by a Japanese company in no way passes any public interest test. Indeed, suggesting that a Japanese company ownership of itself is an issue is borderline racist, especially for a company whose sole purpose is to distribute IP around the entire planet for a modest fee.
The relocation of the company HQ or the jobs might pass a public interest test for government intervention. Such intervention may cost Softbank a small fortune, but that probably won't be a British government issue.
You can judge the success or otherwise of government policy on other issues, but saying that government hasn't given ARM enough money is ridiculous.