At/in a meeting

Hello,

I've been searching this site for explanation about these two and found a great explanation by BarbaraPA:

"In the US, if the person is on site, but unavailable due to a meeting, he's in a meeting.

If he is away from the site because he has travelled to a meeting, he's at at meeting.

I'll be in a meeting today from 3-4. Next week, I'll be at a meeting in Denver."

I'm wondering if in BrE, you use these prepositions in the same way, or maybe there is a difference?

Thank you