Cotic frames say where they're made on a decal on them, and the website says,
"Our frames are designed and developed entirely by us here in the UK, and then manufactured elsewhere. We basically do everything but the welding and painting. For the most part this means sourcing frames built to our designs by the great frame builders out in Taiwan. All our suppliers are truly world class, build bikes all day, everyday, and are brilliant at what they do."
Still plenty of steel work going on in Sheffield, but obviously no where near on the scale of its peak.
Getting Sheffield made cutlery (even if from imported steel) would seem like a no brainer of a promotional tool for a Sheffield eatery. Even if costly.