The digitisation of cars has made comparisons to “data centres on wheels” so common that they’ve become clichéd. It’s also built a booming market for tech firms — few of which have capitalised as adeptly as Arm.  Often described as the UK’s leading IT company, SoftBank-owned Arm designs energy-efficient computer chips. The company’s architectures are found in endless applications, from smart cities to laptops, but they’re best-known for powering mobile devices. Around 95% of the world’s smartphones use Arm’s technology. In recent years, however, the company’s fastest-growing division has been the automotive unit. Arm has reportedly more than doubled its…

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