O
Octopus
I cannot see any manufacturers on there.
They are "tucked away" in the variety of bodies....
e.g.
BEAMA (British Electrotechnical and Allied Manufacturers Association) Association news from Engineering - https://www.engineeringspecifier.com/companies/beama-british-electrotechnical-and-allied-manufacturers-association-association
and
Home - http://www.bcauk.org/