I found a bunch of those SW weekly issues here in the states back in the late 80’s at a curio shop that sold everything from antiques to old magazines. Many of the pages had been colored in by someone with magic markers, much to my annoyance.
I can imagine that would be quite tempting to do as a kid. I did something similar to an illustrated book when I was like five years old. However, it actually turned out really well. I’m guessing you weren’t so lucky?