SCOTTISH politics has been dominated by the SNP's gender self-ID bill.
Opinions have been polarised over the new law, which was passed at Holyrood in December after years of parly feuds over the issue.
But the bill has found itself in the centre of another political storm after it was blocked by the UK Government.
Westminster used a Section 35 order to veto the bill – the first time this has happened since devolution.
But many are still left with questions about the controversial bill and what lies ahead as the row between Holyrood and Westminster.
So what is the Gender Reform Bill and why is it considered controversial?
The Gender Recognition Reform (Scotland) Bill was passed by Holyrood in December.
The Bill aims to allow anyone aged 16 or over to change sex on their birth certificate in a six-month process, simply by signing a legal declaration.
In the rest of the UK, the current rules will still apply with a legal change only granted to over 18s with a medical diagnosis, after two-years living in a new gender.
Backers have hailed the Bill as a major step forward for trans people.
They argue it will reduce the torment of a marginalised group in changing gender.
Critics of the self-ID bill warn it could lead to predators abusing the self-ID system to access female-only spaces, and some object to biological males saying they are women.
The Bill was passed by a majority of MSPs. When legislation is voted on and agreed at Holyrood, it then goes on to receive Royal Assent before becoming law.
However, the UK Government has raised its concerns over the Bill and so have decided to step in to stop that from happening by using what's called a Section 35 Order.
This is an unprecedented move, but it is a step that is open for UK ministers to take under the Scotland Act 1998 if they choose to do so.
Having taken legal advice on the matter, the UK Government concluded that the Gender Recognition Reform Bill would impact on GB-wide equalities legislation.
Well, in short, it is a measure that is included in the Scotland Act 1998, which is how the Scottish Parliament and the Scottish Government was established.
Under this order, the UK Government is given the power to intervene on legislation at Holyrood in certain cases.
This includes if the Scottish Secretary – currently Alister Jack – has "reasonable grounds" to believe that a Bill wouldn't be compatible with international obligations or in the interests of defence or national security.
It also allows the UK Government to step in if ministers think that any changes to the law passed at Holyrood would have an "adverse effect" on the operation of the law in other parts of the UK.
A legal battle is all but certain.
Scotland's First Minister Nicola Sturgeon has said that this will "inevitably" end up in court.
The Scottish Secretary and the UK's Equalities Minister Kemi Badenoch are both remaining quiet just now in anticipation of any forthcoming legal action.
MSPs had requested that Mr Jack or Ms Badenoch appear before them to answer questions on the UK Government's blocking of the legislation.
But, that seems unlikely to happen.
You can expect this row to continue to rumble on, with strongly held views on both sides of the debate.
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