From my background as a nutty conspiracy theorist and UAP researcher, I think it will work.
My research indicates UK is a UAP producing country. This means they have the classified tech to bend spacetime. This would the secret sauce for making confinement fusion work, both magnetic and inertial, you induce small but intense spacetime curvature near the target point.
I believe itâ(TM)s been known for ages, but secret. I also believe there has been a debate in the black projects area about the value of keeping it secret, endless free fusion energy vs secret saucers. The recent events with Hormuz, which work to starve EU of energy, and disintegration of NATO (with possible Türkiye conflict with Israel) are the tipping points that end the debate for the UK. Their national security requires the fusion reactors now more than the saucers. So they are doing it. This secret is why you do not see this as ITER funding, they are doing something different and all their own. What will they tell the world when they do?
Probably they will claim a fusion breakthrough with some kind of dangerous weapons making potential, so the details need to remain secret, except to close EU allies. Regardless, my conspiracy theoretic prediction is the UK will have fusion within several years. Mark my words!