Hi Gizmo,
Yes it is a bit confusing LOL
I looked on the English Villiers site
www.villiersparts.co.uk that you mentioned and clicked on HELP and you
get all the pictures of the engine models
and they have a picture of the engine that we are talking about and it is called a Villiers Midget Mk1 79cc 2 stroke
and then the 98cc is called the mk2 and mk3 barrel numbers B6698
Check this pic
http://www.villiersparts.co.uk/3838.jpg OMG now I'm starting to confuse myself LOL
Cheers Ken