I’m no expert in US law, but Trump fought handing over his tax records all the way to the Supreme Court – I’m sure if there were a similar situation in the UK, he would have been refused appeal to a higher court based on the merits of his case.
Trump is in deep do-do; any other US citizen who had done half of what Trump has done would have been jailed a long time ago.
In relation to the 100s of secret documents seized from Ma- a-Largo, there was a report of a woman in Hawaii working for the secret service; apparently she took home a top secret document and notes she had made at a top secret meeting, for which she was jailed for 3 years - while trump had a mountain of secret documents.
Trump recently recruited a new lawyer to his team, paying a $3 Million retainer up front. He also recently launched a laughable lawsuit against CNN for $475 Million, the main basis of his claim being that CNN don’t like him.
If I were advising Trump, I would say it is coming close to the time he needs to identify some dodgy country that does not have an extradition treaty with the US, and live out his remaining days there.