"This is an established part of proving 'independence' under HMRC probe for IR35"
Except when you work in the security field, there is no way you would be allowed to connect to the client with anything but a laptop built to their spec. I once even offered to buy my own laptop and have them build it for me to try and meet this rule (and also to bypass their shitty old tech that won't run my 3440*1440 widescreen at anything above 42Hz) but no cigar - it's their laptop or nothing.
It's a problem (re: IR35) which is why I take a lot more pains to ensure the working relationship is that of business-business etc. rather than employer-employee (much more important to IR35 imho)