Right of way roundabout

So here is the footage. https://www.google.com/maps/@51.6221048,0.4160826,43m/data=!3m1!1e3?entry=ttu

I can't remember where exactly I saw the guy in the micra but he seemed to be far enough away to allow me to pull out onto the roundabout, which I did. Now I'm worrying if I was actually in the wrong. He is to my right, but I was already over the stop line. I'm not sure if he was or maybe we were both on it at the same time. He seemed to have a dashcam like me so just worried he might report me if I was wrong and could do without 3 points or more on a clean license

You refer to "footage", but your link is to Google Maps. Is that what you intended? As we can't see your dashcam footage, perhaps you could describe what happened. Would it be reasonable to assume that the Micra driver needed to take action to avoid a collision?

With respect to roundabouts, the highway code says (rule 185) that you should "give priority to traffic approaching from your right, unless directed otherwise by signs, road markings or traffic lights". It does not say, "unless you've already crossed the stop line" or "but only if they've already crossed the stop line". If they're to your right, then they have priority.

https://drive.google.com/file/d/1CCpsE-60NQd5i1mi-q_g1VPgPNIigz2Q/view?usp=sharing

The driver did not stop or attempt to i was the one forced to stop. He just blasted his horn.

But if i was already on the roundabout by form of being over the stop line surely its irrelevant if he's coming from the right?

But if i was already on the roundabout by form of being over the stop line surely its irrelevant if he's coming from the right?