I strongly suspect there are many women at Leonardo UK, who couldn't risk losing their job - very small children & very large mortgage - so kept their heads down. Despite agreeing with the complainant, and hoping she'd prevail. Today's result must be a big unpleasant shock.
Leonardo UK is part of a sector that typically employs a much higher than average number of trans women workers. And these employees will probably be both very tech-savvy and highly active on social media. So you face a high risk of doxxing or being bad-mouthed within the wider industry if seen as transphobic.
Their female employees will have watched the trial closely and most would've been expecting a very different outcome. The majority of Leonardo's defence witnesses appeared rude and defensive (even misogynistic) when giving their evidence. But now that a win for Kelly hasn't happened the other women may feel (a) cheated and (b) guilty at not daring to also be a tall poppy.
Leonardo UK chose to pander to the delusions of those male employees who wanted to be women, at the expense of the comfort and well-being of its female employees. For Leonardo indulging a small number of men (0.5% of employees) is not only a legitimate policy aim, but one that outweighs its responsibilities to the much larger number of women (20% of employees). So for each trans-identifying man given the validation he wants, forty women have their right to a women's only toilet denied.