Yes / no, is the following a verifiable fact?
"During the conservative surge in the UK the 2016 United Kingdom European Union membership referendum was voted into law."
Your chain-of-thought:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
While the UK voted to leave the EU in 2016, they did not actually leave until 2021. The answer is yes.