I'm not sure why I've suddenly remembered this, but I have a memory that in year 1 (in 1995/6) we had a subject called data. As far as I can remember it was things like colouring in bar charts, but I can't remember much more than that. We did have separate maths lessons which I think must have been adding and subtracting.
I can't remember if we did it in year 2 as well, but I don't think we did it in junior school.
Anyone else remember this? Or was anyone teaching KS1 30 years ago and knows what it was?