We have a lot of astronomy lectures - worth using search if there is something specific you're looking for. Lectures before 2014/15 - such as Carolin Crawford and John D Barrow's series, tend not to have such great video quality - our alternatives are audio and transcripts. 

General

Why Society Needs Astronomy and Cosmology Roberto Trotta

Cosmic Vision: Attentive Eyes Katherine Blundell (on naked-eye astronomy)

Cosmic Vision: Witnessing Fireworks Katherine Blundell (on the use of astronomical discoveries in past centuries today)

Cosmic Vision: Watching The Radio Katherine Blundell (on Radio Astronomy)

Cosmic Vision: Unravelling Rainbows Katherine Blundell (on the use of light to explore distant universes; 2021)

Cosmic Vision: Fast and Furious Katherine Blundell (on Cosmic Rays, 2021)

Cosmic Vision: Spacequakes Katherine Blundell (on when Black Holes merge, 2021)

Understanding the Universe with AI Roberto Trotta 

Space Sounds: The Music of the Cosmos Roberto Trotta (2021)

In the Beginning Joe Silk (the early Universe, the Big Bang etc)

Dark Matters Joe Silk

Elementary Particles and their Interactions  Joe Silk

Ultra-Compact Objects: Astronomy with Gravitational Waves Joe Silk 

The High-Energy Universe Joe Silk

Lecture series on Astronomy by Blundell, Trotta, Crawford and John D Barrow

Cosmic Concepts series Katherine Blundell 

The Nature of Reality series Roberto Trotta

Astronomy Lectures by Carolin Crawford (from a decade ago - video quality not as good)

Astronomy Lectures by John D Barrow (from a decade ago - video quality not as good). 

Issues

Existential Risks in the Solar System Joe Silk

How Special is Our Universe? Joe Silk

Are We Alone in the Universe? Joe Silk 

How Common is Life in the Universe? Joe Silk

Neutrino: The Particle That Shouldn't Exist Roberto Trotta (2021)

The Moon

50 years of Lunar Exploration Joe Silk 

Great Astronomers/ physicists

Caroline Herschel Discoverer of Comets Sheila Kanani

What has Einstein ever done for you? Roberto Trotta