Hi, I've just had a sale to Guernsey. The sale is only for £10 with free postage. I'm trying to navigate this and from what I have ascetained the postage is the same as for U.K so for a small parcel with royal mail that's £3.69 but what I'm unsure of as there appears to be conflicting information, is do I actually need a customs import declaration and if so do I pay for this? I usually just do my own label.