£16 - £5 - £2 = £9 profit. My mistake. I have been working since 4am!
I think what you are referring to is importing and declared values, which is something very different.
If an overseas seller sends you something worth £100 and marks the value as £10, YOU are evading Duty/Vat/Tax and not the seller.
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Didley Squat now in stock. Going to be a FAST mover!