On a judicial system that covers a lot more than the US Federal Judiciary. Most cases in the US are run by state judiciaries.

The UK doesn't have a federal form of government. The fair comparison would be to add in the cost of municipal and state-level courts.

California spends about $65/citizen.[1] $90/citizen seems to compare favorably to the U.K., at least in terms of outlays. It could also simply evidence that the U.S. judiciary is underfunded.

I'm assuming the Ministry of Justice figure is exclusive of prisons. If the figure includes prisons, which cost ~$85/citizen in the U.K.[2] then court system expenditures would be greater in the U.S. (~$90) than the U.K. (~$65).

[1] $2.5b over a population of 39 million. https://lao.ca.gov/Publications/Report/4097#:~:text=The%2020....

[2] https://www.statista.com/statistics/298654/united-kingdom-uk...

MoJ in the UK runs prisons, courts and probation service.

So what? You can be charged or sued directly in federal court.