This is W.S. Laycock Limited. The factories were in Victoria (Victoria Works), Sheffield.

-Laycock made the 100 HP 1,200 rpm French Gnome Monosoupape under license for English Allied WWI aircraft.

-Better said, it was commissioned to build 1,000 engines, and the only one known is the one in an English Museum as it appears in the following photograph.

“Laycock 100 HP”

“Detail of the W.S. Laycock engine plate ”(JGB)