I copied this from Spinster. I also checked the content and it is accurate.
It quotes from the Hansard Report of one of the debates that happened in the House of Lords at the time the Gender Recognition Bill was being prepared. I think it is important because it explains a lot.
It explains that the issue of a GRC has relevance only in relation to certain laws and is not relevant in wider private society.
Lord Carlile: "When it says in the Bill "for all purposes", it means for all legislative purposes."
Lord Filkin: "I sought to set out in Committee that the Bill's basic principle is that the issue of a gender recognition certificate by the judicial panel would mean that a person's gender becomes for all purposes in law the acquired gender.
Lord Filkin: "The intent of the Bill is that if gender has been changed and a person is recognised in law as a woman as a result of the process, they are a woman for all legal purposes relevant in other legislation."
Lord Campbell of Alloway My Lords, does the Minister mean for all purposes recognised by law?
Lord Filkin My Lords, I do exactly, yes.
Lord Filkin: "The noble Baroness also asked whether people who refuse to call a gender-changed man by the changed gender would
be open to action. No, they would not, unless they had information about the person's gender history in an official capacity and they disclosed it otherwise than is allowed for by Clause 21."
Baroness Hollis: "Clause 21 does not involve the criminalisation of activity that is purely in the private sphere. That would not be appropriate."
[Clause 21 became Section 22 in the final Act that passed in to law.]
api.parliament.uk/historic-hansard/lords/2004/jan/29/gender-recognition-bill-hl#S5LV0656P0_20040129_HOL_228