Is now a good time to advocate for prediction market governance experiments in the UK?

The UK already has mechanisms to investigate the impact of proposed government policy, in this case the Office for Budget Responsibility which provides independent economic forecasts. The Chancellor and Prime Minister refused to allow the publication of these forecasts alongside the mini-budget that caused market turmoil. I'm not sure you can reasonably blame the quality of existing forecasting mechanisms when the relevant decision-makers were openly disregarding them. 

Dominic Cummings wrote about how it's hard to get UK politicians to say the things that voters want to hear according to polling data and thus hard to get them to maximize their chances of winning.

Getting them to give up part of their power over law-making would be much harder.

I'm an American. I don't understand UK politics. All I know is, there was once a PM named Liz Truss. Liz did something the markets didn't like. Now PM Liz is no more.

It's not only that the market didn't like it. Many people don't like taxes for the rich to get cut. 

Won't conditional prediction markets give rich people more ways to influence policy?
Let's say the people of Examplestan have a large underclass who live paycheck to paycheck and a small upperclass who gets their money from inheritance. The government is thinking of introducing a bill that would make their tax revenue come less from paychecks and more from inheritance. Democracy advocates want to put it to a vote, but a group of futarchy lobbyists convince the government to run a conditional prediction market instead.

The market question is "If we replace the paycheck tax with an inheritance tax, will welfare increase?". The large underclass has almost no money to bet that it will, while the small upperclass bets a large chunk of their money that it won't. Predictably, more money is betted on it not increasing welfare and when the market closes, everyone gets their money back and the government decides not to implement it.