I don't know how reliable SKY News is, but I've found this:
Karen Todner, who dealt with attempts to extradite computer hacker Gary McKinnon and alleged hacker Lauri Love to the US, told Sky News an MLA makes it virtually impossible for the UK government and Home Office to avoid the ongoing battle with Prince Andrew and they will inevitably be involved.
Home office guidelines say the department will not confirm or deny the existance of an MLA.
She said: "From my understanding the Americans are not happy about Prince Andrew giving
a prepared statement, that's not what they want from him, they want to have the opportunity to ask him questions and for him to be under oath when he does that.
She added: "Prince Andrew doesn't have diplomatic immunity so if the process has started it will follow through. There are various reasons that the UK authorities would have to look at to show that the mutual legal assistance request was valid, that it was asked for the right reasons, but I can't see any issues with that at the moment."
Asked how long that process may take, Ms Todner said: "I think it'll certainly be resolved within the next six months or so, if his legal team decide to judicially review the issuing of the mutual legal assistance request that in itself can take anything up to a year.