[JAS84]

No it isn't. It's just the only one other than STV to use it's own branding on networked shows (well, I guess UTV would too, but they never make networked programmes) - other regions use ITV Studios or one of several other labels ITV has launched over the years. Corrie is made by ITV Granada, Emmerdale by ITV Yorkshire, but both have the same ITV Studios endcap. The same would be true of shows made by ITV Central, ITV Anglia, etc.