So it came as a shock to discover this advert from 1909. Not only was the brewery not Mild-only, they brewed two different Bitters. And a Stout. Part of me is deeply disappointed. The rest realsies expecting Highgate to have been Mild-only forever was a bit naive.
The Old Ale wasn't a surprise. They did brew one of those in the 1980's. And it's justy a sort of Mild really, isn't it?