As a Canadian, I have never heard anyone refer to zero as zed. I guess in theory if I was reading out a label or something that specifically had a "Z" to signify zero I would say zed, but that's because I'm saying the letter rather than because I'm saying zero, but I can't think of any time when someone would label something as "Z" to mean zero when they could just do "0", so I don't think that's common.
Sorry bud.