Barrhead, I've only ever seen it once, how about you? I saw this one at the Victoria And Albert museum in London, near the entrance in the underground subway from the tube station.
This was the only cubicle with it, the rest had older batch Armitage Shanks as usual, in a new toilet I check all vacant cubicles, and this was the odd one out.
It looks very similar to Armitage Shanks doesn't it? though on the outside you can see the rim while the others you can't. I suspect the reason this is in here is that either there was an Armitage Shanks here before that got broken and they replaced it with this because it looks similar or they were all Barrhead and the Armitage Shanks replaced them.
The logo looks quite unique, I wonder what it is supposed to look like.
The handle I have come across several times yet I don't know what brand it is, I'm thinking an older Armitage Shanks.
Sound and flush are good, nice pressure.
Enjoy the video.