@MrsOvertonsWindow Thank you 
To @MaybeDoctor and anyone else who is new to the sport, I've written a bit below to help break it down. It's been a long time since I've fenced, so I've brought some context from my male partner, who is a long-term fencer:
General overview of the sport:
There are three weapons - Sabre, Epee and Foil. Each weapon comes with different rules. My partner has been fencing regionally for almost 20 years in two of these weapons.
How you perform is based on a combination of skill, experience, form, strength and speed. A skilful experienced fencer will be able to beat someone stronger and faster, but for two fencers of equivalent skill and experience, speed and strength will give additional advantages.
Speed is important for faster footwork and faster, easier arm movements. Strength is important for parrying, holding blades and breaking through parries. Fitness also plays a role: a hard fight to 15 points can be extremely tiring, and fitter fencers have an advantage in the end.
There is also an advantage in being taller (longer arm reach, extending the blade). Being aggressive and being more intimidating also gives a psychological advantage against opponents.
The majority of fencers at competitive tournaments are men, which provides its own advantages for men developing and progressing in the sport.
To summarise the differences: a few years ago, my partner took up a new weapon. When he was first learning it, he was a complete beginner and used to get beaten by women all the time. With just five years training in that weapon, it is now rare for him to get beaten by a woman.
Some anecdotal examples of the advantages men have:
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In the tournament circuit, there are friendly mixed-sex tournaments called 48’ers. Competitors get split into 8 groups of 6 fencers each, and those who do well advance into higher groups. Those who do badly end up in lower groups. My partner has participated in many of these tournaments and has never seen a woman make the top group at the end of the day. It should theoretically be doable, as it’s aimed at the average fencer, but women making it to the top in this mixed-sex context is rare.
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At rated competitions, finals take place one after the other -- you have the women’s final then the men’s final. Any experienced fencer will immediately notice the difference between the two. My partner, who is again a regional fencer, has beaten women who have won opens. He has never come anywhere close to beating a man who has won an open. If the medallists of an open held a team’s match of men vs women and fenced each other competitively, it would not even be close.
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To illustrate the difference between sexes, my partner recently fenced the male #1 fencer of a large country. On the same day, he fenced the women’s #1 of a similarly sized country. He had no idea at the time that either of them were international champions. The man was by far the best my partner had ever fenced -- matches go to 15 points, and my partner was roundly thrashed. When my partner fenced the female champion of her country, my partner managed to win. They had a few other matches after, and she won some, and my partner won some, but the point is it was always close.
A final thing: the only people in his club he's ever heard saying women’s fencing should be open to transwomen... are men. Men are not the ones who will be adversely affected by the decisions made, and with the large majority of British Fencing members being men, they'll drown out responses from the women who actually fence in these competitions and are the ones who will be affected by the decisions made.
So women, please, please respond to the consultation to help our women fencers!