Yes.
SF acted for Joanna Cherry et al concerning their action against prorogation of Parliament.
SF was one of the three authors responsible for the written submission. I don't know how much influence Cherry had about the selection but I should think she's senior enough to have had someone removed if she considered them ill-suited to the task.
Sam Fowles (@SamFowles) is a Barrister at Cornerstone Barristers. He was junior counsel to Joanna Cherry QC MP and others in the Cherry/Miller cases
https://ukconstitutionallaw.org/2019/09/26/sam-fowles-cherry-miller-whats-next/
SF claims that "90% of what we are doing is not law, it's dealing with facts, it's dealing with people and the unique situations that people find themselves in. And if we try and treat the law as some sort of antiseptic science then you don't understand it properly in my view." SF talks about the role of facts, evidence, and the fundamental value of individuals. (YT video of the lecture.)
I would like to see SF encompass women within that. Despite the bravura post the AD-interview, I'd like to think that SF is capable of reflecting on that performance and deciding to investigate GI with due diligence to the point of being confident to put up decent arguments with verifiable citations, data, facts, evidence. I would like to see SF study up to be the evidenced advocate for gender ideology that so many have wished to see. It would certainly help Helen Joyce (and others) to write another book if they didn't have to supply arguments themselves, by default. (Legacy of "No debate!" or an absence of rationality or evidence?)