I ask NOT about court opinions. The UKSC doesn't publish them, but what of lower courts?
Can I get a copy of a party's 'skeleton argument' or case?
The UKSC does not publish parties' cases. [...].
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A submission is simply the name for that part of one side's case which is submitted to the court but is not evidence, whether that is 'I suggest there is no case to answer' or a day-long oration. As such, they are not normally written documents, and so are only generally available by obtaining a transcript of the whole day's proceedings . Even if this is possible (not all cases are automatically recorded) there is certainly a charge for it.
There are exceptions, of course: the Supreme Court, less bound by tradition since it was created only recently, prefers to read advocates' speeches rather than listen to them. And advocates do in practice often write out their speeches, so a particular submission might be obtainable by suitable flattery of the advocate (or more likely his clerk/secretary). But in general, the answer is "you can't".
Generally, you can't. These are private documents, only the judgement is public.