It is actually included in the standard license, just the documentation for enabling it is quite easy to misunderstand (it mentions several times that it's for business only, but what it means is needing to enable it is business only. It's already enabled for standard users). Confused me too.

You also lose £2k worth of tax free childcare instantly as soon as you earn £100k, a rare instance of it actually being possible to earn less money by getting a payrise