Those are the ones M-U!!!! I've still got a blue/beige one somewhere - another thing I couldn't bear to part with.
They were soft covered as I recall.
They weren't by any chance called Beacon Readers were they? Thats just popped into my head - but I could have just made it up
You are right about the size too M-U.
Check this out M-U
Look at J,K and L
I think thats the one I have - Fantastic Beasts
I think they were like supplementaries once you'd read the class reader. A bit like a mini library within the class. Crikey we've gone back ages!
Too old for Janet and John. . . .
Once I wasn't too old but now I think I am Joyce!