It's a shame so many of those who have commented here haven't fact-checked the article -- and even more of a shame that Janice turner didn't fact-check it herself!
James Caspian is perfectly within his rights to research this topic if he wants to: I don't think anyone has prevented him from doing so. But it is at least the third time he has tried to persuade the university to approve a thesis on this subject. The main stumbling block for the previous two is that he simply couldn't find enough "de-transitioners" to make it a valid piece of scientific research!
That's not terribly surprising, really, given the psychiatric hoops that transsexuals have to jump through before they get HRT, and the compulsory "Real Life Test" (at least a year, usually two or more) living in their new gender but with the wrong "bits" before they get referred for surgery. There can't be many that make it all the way through the painful, expensive and embarrassing 4-5 year process only to change their minds afterwards!
Of the tiny number who do "detransition", it is likely that a significant proportion do so because of the constant barrage of transphobia to which they are subjected -- whipped up by columnists such as Janice Turner herself and by organisations such as the so-called "Christian Concern".
It may be significant that the university didn't specify where they expected the hate mail to come from. Ms Turner implied that it was from trans-activists, but I suspect it is more likely to come from the anti-trans faction. They are much more vociferous than the pro-trans activists, and would certainly not like an academic study to reveal the immense harm that they do!
Still back to fact-checking she claims that "Trans activists are lobbying hard to change an NHS policy document called the “memorandum of understanding”: they want to extend a ban on gay “conversion therapy” to include gender identity." But that is simply wrong! Why would they? It already does include gender identity!
And the MoU is not just an NHS document: as well as NHS England and NHS Scotland, it also carries the signatures of all the major professional bodies - more than a dozen of them - that represent psychiatrists, counsellors, and doctors. They agreed that conversion therapy of homosexuals was unethical back in 2014, and extended the MoU to include gender identity nearly a year ago.
And in July this year General Synod of the Church of England supported all these professional organisations, by calling on the Government to make conversion therapy illegal.
Please don't take my word for it: just google "Memorandum of understanding" "conversion therapy".