Apologies, I didn't see it as you didn't actually tag me.
Wherehas could you give some examples of the questions you think should be asked?
I think I answered this in a general sense in my post: questions ensuring that people understand the basics of how the political system works, the respective duties and responsibilities of the House Of Commons, House of Lords, local Councils, interaction of UK law with international law, the roles of Parliament vs the judiciary, the BOE, basic principles of economics and how interest rates, money supply and inflation work and what causes them e.g. the difference between demand driven and supply driven inflation, to show that people voting are making informed decisions. Otherwise the decisions clearly will not be in the best interests of the majority because they will be (and are) often based on false assumptions, ignorance and easily manipulated. This is basic stuff every adult should know. And if they don't then they have no business trying to decide things on these topics for their fellow citizens. It should also include a basic understand of how much tax is raised from which taxes and on whom, what proportion of tax is spent on different services, and also some test scenarios where people are given a set of evidence and then asked to draw conclusions from it to check that they are capable of rational thought processes.
What would happen to people who spoke poor English?
It's not a language or spelling test.
How would cheating be prevented?
It would be sat in exam conditions like the UK citizenship tests.
Who would mark the tests?
Exam markers.
Would anyone who boycotted the test have their right to vote revoked?
Yes, passing it should be a prerequisite for voting.