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According to a list, I've made and that contains all the newest info I can find, there are around 47 Non-PRM ones left. However, only 39 of those are currently in service. If you add the ex-Northern Stuff, you get a figure of 47 units left in service. However, as we all know this number can...
But as the above poster @ls2270 mentions you’ll hardly ever be able to get details in advance, this sort of detail relies on observations and/or railway system insider access on the day.