Dakota Rose is correct - they are called tracing wheels and were/are used in pattern making and garment construction with some sort of transfer paper. They come three different ways - Serrated (has spikes and gives a series of little dots) and two types called Blunt (one that looks scalloped - which I assume gives you little dashes and the other a solid disk like your friends).
I looked at Amazon UK this morning and they clearly have a blunt one from clover as well as another by Prym called Smooth.
https://www.amazon.co.uk/Clover-Trac.../dp/B00292BPEM
https://www.amazon.co.uk/s?k=prym+tracing+wheel+smooth&i=kitchen&ref=nb_sb_noss
There is always Ebay as well. Should not be difficult to find one that works for you.