Ha all good @Mallard4468 . Thanks for the heads up because if that was the case you would’ve saved me Big time. Usually when I’m doing the actual searches I reference back to a logo that has Hornby Meccano although often times google ends up auto-filling parts of it.
i did just look at a Meccano pedestrian walkover bridge that I have. “Hornby Series Manufactured by Meccano Ltd. Liverpool”. Using my phone so I can’t bold letters, but possibly “Manufactured, Meccano, Ltd.” MMLD(superscript).
Looked into patents- it is indeed Hornby @rdigilio And @Fatman - I owe you two dinner.
The MMLD with England underneath is actually M Ld L= Meccano Limited Liverpool England.