1(1)The value of any imported goods shall be taken to be the normal price, that is to say the price which they would fetch, at the time when they are entered for home consumption (or, if they are not so entered, the time of importation), on a sale in the open market between buyer and seller independent of each other.
(2)The normal price of any imported goods shall be determined on the following assumptions:—
(a)that the goods are treated as having been delivered to the buyer at the port or place of importation ; and
(b)that the seller will bear freight, insurance, commission and all other costs, charges and expenses incidental to the sale and the delivery of the goods at that port or place ; but
(c)that the buyer will bear any duty or tax chargeable in the United Kingdom.