This is a very revealing thread to be honest.
This article in the Telegraph is really scraping the bottom of the anti-trans barrel, trying to generate outrage about a practice which is long established, done for sound legal and practical reason, has absolutely no impact on anyone else, and isn't even really an advantage (as others have explained, it means you can't use online services and the PDI phoneline does not guarantee a short wait or someone at the end of the line who can help you). And yet so many here have fallen for the rage bait hook line and sinker, many apparently without even properly reading the article or doing two seconds of research which would answer many of the questions and presumptions made on this thread (no, this isn't new; no, you can't just phone up HMRC and say you're trans to get special treatment; no, it's not done to protect frontline staff from the horrors of having to speak to trans customers; no, it's not done because trans people like to complain; yes, getting a GRC impacts your pension entitlements if you're of an age where your sex makes a difference; etc etc). It is genuinely fascinating how a group of people so utterly obsessed about trans people actually know so little about the reality of their lives or the legislations and processes that impact them. You'd think perhaps that's the kind of thing you'd need to learn a lot about before forming such loud and strident opinions that you then expect everyone else to take incredibly seriously. But apparently not.
What is apparent is that this has nothing to do with women's spaces, fairness in sports, safeguarding, prisons, hospitals, rape crisis centres, or any of the other shields the gender critical movement likes to hold up to pretend that's what their movement is about instead of simply being an objection to trans people existing. Threads like this make the lie in that abundantly clear - what we have here is a group of people throwing their toys out of the tram with full force over a minor administrative process that doesn't impact them in the slightest, just because it involves acknowledging trans people exist and have a legal right to privacy and protection from discrimination, something any person in connection with reality and with a shred of human decency would have no problem with.