How did Birmingham City break the EFL League 1 transfer spending record?

How much they spent, how did they pull off the Stansfield signing, what FFP regulations now apply to clubs competing in EFL Leagues 1 and 2, what is Salary Cost Management Protocol (SCMP), what owners can do but and why they have to be mindful if they are promoted, how many players left the Blues in sunmer and what academy player sales represent in PSR calculations, my view on it all...