And it's been available at least since the mid-1990s. Boddingtons might not brew in Manchester and Youngs might not brew in London, but they did then.
The yeast suppliers often clean up or otherwise fiddle with the yeast before they sell it. So they are often reluctant to say things like "WLPnnn is <brewery's> yeast" so I always ask "Did that yeast originate at that brewery?"
There are a few strains that I know positively the source since I heard it straight from the suppliers. This isn't one of them, so I would like to know.