Unfortunately, the war is really around the definition of gender identity.
If a tribunal should accept that male and female exist within one body - be that body male or female - and it is the inner gender identity that determines if the sexed body is male or female then this means that if a person feels like a woman then a penis is the outward expression of femaleness and if a person feels like a man then a vagina is the outward expression of maleness. Gender identity and sex become synonymous. There is no need for any surgery or hormone treatment.
There is then no need to live as the 'opposite sex' as this term becomes essentially meaningless.
All a person has to do is convince a tribunal that they feel like the sex with which they internally identify. There is no way to objectively show that this is the case and we have no reliable form of psychological assessment to show that this is the case.
Thus the tribunal becomes increasingly meaningless and the pressure for self-id will never go away whilst this idea of sex is in the ascendency in the powerful circles that are determined that this re-definition of sex will go ahead.
This is what is effectively happening already and the ideological basis for this approach is set out in the paper by Stephen Whittle (who has been an influential government advisor) posted by TimeLady
www.socresonline.org.uk/12/1/whittle.html