Well yes, that's what we all know or at least suspect. Denton's Playbook and all that. And I completely agree that the Champions scheme was a nightmare in waiting: companies know there is a social value in being accepted into the scheme, and even more value in being in the top rankings. So they not only bend over backwards to do what Stonewall say but to outpace other companies for a place in the Top 100. It placed so much power in Stonewall's hands with - as far as I can see - no oversight or safeguard.
My question was whether they could claim in court that they truly believed at the time that the advice they were giving - and the actions they were encouraging companies to take - was correct and only found after the SC ruling last year that they weren't.
(Of course, what someone claims retrospectively as a defence and the reasons for acting in a certain way originally may or may not be the same thing...)