Equality Bill

I fail to understand why the figure 250 has been picked. What matters is that people are not discriminated against either overtly or covertly and it does not matter whether the employees are five, 20, 100 or 1,000. Discrimination is discrimination, so I am surprised by the number. It may sound interesting, but mathematical calculations in a Bill such as this are never helpful. I do not understand why the figure has been asserted, and if, as the provision says, a public authority has a public duty, I do not understand why mathematics is beginning to come into it. Maybe I need to go back to primary school and then I will know that 250 is the level at which it is impossible to discriminate.