I ask NOT about court opinions. The UKSC doesn't publish them.
Can I get a copy of a party's 'skeleton argument' or case?
The UKSC does not publish parties' cases. [...].
Yet Gina Miller tweeted to her skeleton argument for her Claim No: CO/3385/2019 at the QBD, on her solicitor's website.
Googling "Skeleton Argument of the Secretary of State" yields just 27 results, e.g.
government's skeleton argument in the Article 50 case in England and Wales, CO/1306/2016) at QBD.
Secretary of State's Open Skeleton Argument, Secretary of State's Skeleton Argument for permission renewal application, R (on the application of Campaign Against Arms Trade) v The Secretary of State for International Trade and Intervenors [2017] EWHC 1726.