it's a small brand owned by Akzo-Nobel (a vast conglomerate), they (used to) specialise in products that weren't mass market, including marine paints, I've seen them at Wilkinson and Homebase.
I just looked, and their website now has no link to a UK page, so I suppose it's possible their products have now been absorbed or replaced in one of their other brand names, such as Dulux.
https://www.akzonobel.com/about-us/who-we-are/brands-overview
http://www.international-pc.com/markets/markets.aspx
I see Wilko's are still selling tile paint as an own-brand, presumably made for them in some big paint factory. Maybe it's similar.