I've got some of them but not the ones like that. The flat ones. Ideal for bending lips or flattening edges on sheet. The tool goes by the name of "the flattners" for me.I think you’re actually onto something. I cheated and Googled it and there was one sold called something similar. If you look up generic door skin pliers they’re nearly the same.
I tried to find a Warwick catalogue, just out of curiosity really, but no joy.