Be careful about reading too much into that—“Large enterprises, those with 250 or greater employment, accounted for only 0.4 per cent of all enterprises.” according to the ONS. You’d expect to see 89.4% small companies by chance alone, although I concede that if a company is around for 100 years you might expect it to grow into a large company by inertia alone.
With respect to your other point, you are absolutely right—I wanted to show my working here to indicate how badly wrong back-of-the-envelope calculations can go in situations like this.
Be careful about reading too much into that—“Large enterprises, those with 250 or greater employment, accounted for only 0.4 per cent of all enterprises.” according to the ONS. You’d expect to see 89.4% small companies by chance alone, although I concede that if a company is around for 100 years you might expect it to grow into a large company by inertia alone.
With respect to your other point, you are absolutely right—I wanted to show my working here to indicate how badly wrong back-of-the-envelope calculations can go in situations like this.