That’s a lot of questions 
and radical feminists aren’t the Borg, so I wouldn’t seek to represent All Radical Feminism. I don’t know how you feel you can give simple yes/no answers to all of them, they are not simple questions.
Are you saying the current Gender Recognition Act should be repealed?
I don’t know. I certainly think it is very unhelpful to conflate legal recognition of gender reassignment with sex. They are not the same thing.
If so, are you suggesting withdrawing hormones from those who have already transitioned? That’s a question for individuals and their doctors isn’t it. I do think that people should continue to receive a diagnosis of gender dysphoria before being prescribed medical treatment for it on the NHS, treatment should not be available on demand funded by taxpayers. Psychological support should be much much much more easily available than it is now, although that is across the board, not just for individuals with gender identity issues.
Do you think a fully transitioned trans woman with a GRC to ‘prove’ she is a woman (eg Nadia from Big Brother) should use the men’s loos and be in a male prison / care home / hostel?
I don’t know who Nadia from Big Brother is. Currently fully transitioned transwomen are generally welcomed in women-only spaces as a courtesy on an honour system. Unless their individual behaviour is problematic they are generally accepted. That’s fine. It’s when self-trans-identified men who make little concession to transition or respect female social norms attempt to force their way into women-only spaces as a way to validate their identity, that women have a problem with it. The problem here is the trans umbrella encompassing all non-gender-conforming people and granting the same rights as transsexuals or those with crippling gender dysphoria, to fetishists and sexual predators, and if women are not permitted to differentiate, then none would be welcome quite frankly.
Do you think TRAs who say things on Twitter like ‘suck my ladydick’ and 'enjoy your erasure' are representative of transgender people as a whole?
I think they certainly seek to be, but I doubt they are.
Do you feel transgender people threaten your safety and well-being as a woman? If so what personal experiences (not what you have read on Mumsnet / Twitter / Reddit) have made you reach this conclusion?
Some transwomen do, just as some men do. I have had very uncomfortable experiences at gigs for example and was injured by a transwoman at one. But this question feels goady to be honest, no feminist I’ve ever met would agree with such a blanket inflammatory statement.
Do you think current exceptions in the Equality Act (eg it is legal to exclude trans women from competitive spots and certain job roles such as rape crisis counselling) are sufficient to protect women
Well, they should be, if they were upheld. But if the GRA is amended to allow self-declaration then the exceptions would be meaningless.
If your male child repeatedly told you they were female from the age of three, wore dresses, played with girls etc and were very distressed at the thought of male puberty, how would you help them?
No one can, or should, answer this with a one-size-fits-all answer. Until one lives they experience one can never know. But I’d hope the answer would be age-appropriate explanations of what male and female mean, what sex and gender are, that wearing whatever you like and having whatever friends you like doesn’t alter your sex, but your sex doesn’t stop you wearing or doing whatever you want, constant loving non-judgemental support to do, wear, be whatever they wish to be and seeking professional psychological support if appropriate (real, open minded, psychological support to help them understand and manage their dysphoria, not blind woke gender-stereotype-affirming “support”). I’d look for gender critical support groups for parents to support me with how to best support my child so they can hopefully grow up happy and healthy in their own body, trying to reduce the risk of them spending their life chasing a futile impossibility, reliant on medication, infertile, surgically scarred.
Question for you - why are you interested in how feminists would support their male gender non-conforming children, and not female ones?
Btw - I would try to support my child to live the life they need to live as best I could. I guess this makes me a lib fem. Nope - that’s what makes you a good parent. Liberal feminism is feminism which seeks to effect change within the current system (patriarchy); radical feminism seeks to tear the system down and build a new, equitable one.