The ‘company lawyer’ referred to will be Hachette’s in-house legal advisor, rather than Mermaids.
@NoSquirrels - I can't that is right based on the Sunday Times article - quote:
In response to the invitation to suggest changes, the head of legal and policy at Mermaids sent four closely typed pages, including a comment that the article “doesn’t come over as balanced”.
and
Five days earlier, James Benefield, a senior executive at Hodder, had sent Yule the Mermaids review and told him: “Mermaids have requested quite a few changes here. It is important we do follow all of the attached advice — not only is it from a trans-specialist organisation, it is also from the company lawyer who felt they were best placed to review the piece.”
So I take it the "company lawyer" was the head of legal at Mermaids, ie the Hodder executive was emphasising it was not just from some PR person at Mermaids, but from their senior legal representative (and so presumably Hodder were too scared to argue with it).