Ask HN: How to talk with logical flow and coherence at interviews?

I have noticed that at interviews, I struggle to build a proper narrative and talk coherently. I live in UK and English is not my first language which doesn't help. Most of the times the flow of my conversation is not fluent and it feels like I am putting up sentences one after the another and there is a ot of "mmmaa", "mmmaa" in my talking. Are there any practical resources to improve my conversation skills?