Looking at your items, they are listed as being sent from Thailand - which I assume is accurate.
That means 20% VAT and high postage costs for UK buyers. Also, it looks as if items will take up to 3 weeks to arrive.
I would guess those are the issues and explain why you are not selling here in the UK.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)