@Addiscomber you were spot on!
It never occurred to me that they might be by Jean Greenhowe but after reading your comments I looked at her website.
I couldn’t find the original pattern there but could tell they were obviously her designs.
I then trawled through eBay and eventually found the patterns. Someone had taken them from a magazine, Woman’s Weekly (my Grandma’s favourite).
I paid the princely sum of £3.00 and they arrived this morning. I was expecting a poor photocopy but got the original pages.
So, as soon as I’ve finished the hat and gloves that are on the needles, Topsy and Tim will be returned to their former glory.