There's a lot of thoughtful replies on here, things I hadn't considered and lots to think about. But, I still very much stand by the stark statement below:
I'm scratching my head a little and wondering how on earth the life of a pre-anything transexual women can be anything like a cis-women? As there are few similarities (as society will not recognise your femininity), the very concept of "trying your target gender out" in the real-world, is rendered completely pointless. As your experience will not bare much resemblance to what a cis-woman or passing transexual might have.
Ultimately, I think that RLTs are seriously flawed concepts, and are very dangerous to the individual and potentially damaging to the movement as a whole.
I wholeheartedly believe in checkpoints, rigorous analysis and gate-keeping in order to guard against people making mistakes, not taking responsibility and then sueing the medical establishment to cover their tracks. Transition and gender exploration are complex, they take time, they need time and they need logical rational steps to be taken to ensure that as much careful thought, planning and personal insight has been poured into the decisions and action, as possible.
However, RLT and RLEs are not the right way of going about enforcing gate-keeping in order to promote responsibility. Gate-keeping should involve continuous assessment in a safe environment (hospital, clinic, at home etc) at every step of the process. So that the patient can explore what they feel they want and need to do, without being put under highly stressful conditions.
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A non-passing, pre HRT transwoman is potentially going to lose their job and counter nothing but abuse in a RLT. This negative experience may simply force them back into the closet, or (at best) simply make them live through an awful time.
As for using RLT to try to get potential trans* patients to realise the gravity of their requests - instead of the RLT, potential patients for GRS or hormones should undertake psychiatric tests and signed legal papers stating "I am of sound mind, and I understand the consequences of my actions. I have been fully informed of the potential effects of my actions and on this basis, I take full responsibility as an adult over the age of 18." This would be the same sort of declaration you have to sign when writing a will. Your not expected to take a death RLT test in order to test whether you really want to give your money to that person or not.
RLTs are simply an easy way for state-funded medical establishments to reduce the amount of people claiming treatment. Which is why if you go private, there are no RLTs'. Its simply about reducing costs. Its not about care.
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Plus I don't like being treated like a little kiddy. I've had a psych evaluation - I'm perfectly sane. And, as I've discussed at length with the NHS, I understand the conequences. If I get this wrong after all this, then its my own fault. This is adult responsibility.