Ok, Thanks for replies.
It's
these I appear to have 6 of them (thought I had more than that) got them new for 20p each from charity shop
they're more for the summer really so I may have made a mistake listing them for March, I'll take that risk.
As Royal Mail will soon be offering Large Letter International I may look into offering some of my YDC items under 100g outside of UK, including these new portable dog food/water bowls. As I offer free UK postage for my large letter items (I don't list anything bigger than that) it would seem only fair that I pay 74p of the International postage cost, hmm something to think about over the next couple of weeks.