OK, this may be difficult to prove either way as there is so little online about this series, but I propose...
Luna, an ITV kids show (1983 -1984) that ran for two series (only 12 episodes in total).
The show was about the domestic life of an eccentric family group set in the year 2040 - although in the setting the characters are not in fact biologically related but assigned to shared living quarters by the bureaucracy.
One of the characters is 80H (aka Sid). 80H/Sid is a "bureaubeing" and did wear a shiny black space suit complete with menacing black helmet. The helmet was pointy, but no horns. See the only image I can find of Sid online below. Sid is on the right and he isn't wearing the helmet, but the helmet is in shot (held by the person standing next to him).
While wearing the helmet Sid spoke with a ring modulation effect (think Daleks and Cybermen).
Sid is a Sector Coordinator for the Bureau Bureau, but his boss was the Galatic Coordinator. So there is the 'galactic' link. There is also an Assistant Galactic Coordinator. I've no idea if either or both of these wore a red version of Sid's uniform.
In the UK, the first series was shown twice and the second series only once. No episodes have aired since the end of the second series.
The only country to show Luna outside of the UK was New Zealand.