Re: Hot desking
Hmm. I seem to recollect 1980s rules in Blighty specifying a minimum area per person. 40 sq ft from memory, which is just under your 4.6 sq m but in the same ballpark (and it may have been fortysomething).
I first encountered it because someone at my employer at the time (I guess the person with elfin safety somewhere in his job description) was mildly unhappy that its office space was violating the law, and there was nothing anyone could do about it.