I found something similar about this
earlier today, but for the life of me I can't remember where.
If I recall, it may be something about encoding and with that in mind have a look at the two links below;
If neither help, the Google search term I used was WLM how to change encoding so you may have better luck with that.
Anywhere near Sutton? I lived there many decades ago. My family moved to Ipswich, then Cambridge, but I found them each time!