The British Astronomical Association (BAA)
https://www.britastro.org/
Society for Popular Astronomy (SPA)
http://www.popastro.com/
Sky At Night Magazine
http://www.skyatnightmagazine.com
Astronomy Now Magazine
https://astronomynow.com
Astro Cymru
http://www.sciencemadesimple.co.uk/shows/astronomy-and-space
Stargazers Lounge – Astronomy Community Forum
http://stargazerslounge.com