Was I imagining Nancy said there was no objection to the word mother?
“There is good work on your policies, and it’s good to see clear commitments to trans staff,” the Stonewall assessor wrote. “The majority of your family policies are gender neutral which is good, but you use ‘she’ in the maternity policy and I recommend reviewing the glossary to expand the definition of ‘mother’ to ensure it is fully inclusive.”
From the Times.
If you go to this thread
www.mumsnet.com/talk/womens_rights/4404670-Womans-Hour-18-11-2021-Nancy-Kelley-CEO-of-Stonewall
and go to DadDadDad's posts beginning 18/11/2021 22:11 they have kindly transcribed what Nancy Kelly said. It's pretty much 'we don't want to remove the word, but you could change it'. 
NK: Sure, sure. So, the first thing to say is that we’re not interested in removing or erasing the word “mother”. I’m a mum, I’m married to another mum, there’s lot of mums in our house. When we offer guidance on how organisations can make their policies more inclusive we do typically offer three different options to people. We say you can use additive language. So you might say “mothers and other pregnant people”, you might say “mothers, fathers, parents etc”. We say you can use gender-neutral language. So that would be kind of “pregnant people or parents”. Or we say you can address policies using the word “you”. So “when you become a parent” – actually that’s what we use in our own HR policies at Stonewall.
NK: I think in that document, which is a historical document, there was a notation—
EB: It’s not that historic. It’s only two years ago. You’re talking as if it’s ten years ago, if it’s historical.
NK: Sure, it was a couple of years ago. But it was indeed taken out of context of the conversation which was about those options. And it’s absolutely the case right now that all of our guidance suggests that those are three ways that people can make sure that everyone knows that policies apply to them and they are included in them.