In this context, by UK do you mean Ukraine? Because I can't see how the United Kingdom would make sense.

Anyway, assuming it was Ukraine, then, yes, the western equipment made a lot of difference. In the first months of the war it was the Javelins, and the NLAWs. Then it was the HIMARS. Then the anti-air defenses, like the Patriot. All these things absolutely made a difference.

The problem is that there was not more of those. But that was by design. You could say that not in a thousand years would Putin actually use nukes. But I bet you said he would not invade Ukraine until the day he did.

Right now Ukraine is still standing, and Putin did not use nukes. It could be better, but it could be worse, much worse.