Both Yorkshire grit and Hampshire sheen are stocked by Dan @ Taylors Mirfield.
Glyn Senior makes Yorkshire grit, and Hampshire sheen is made by Martin Saban Smith.
They have licensed people in other countries to make said products under those names.
I haven't used either to be honest as they are wax finishes. Might try some on wall mounted stuff, or furniture, at a later date but not pens.