The amount of earnings which is comprised in any payment by way of the conferment of a beneficial interest in any units in a unit trust scheme (within the meaning of section 75(8) of the Financial Services Act 1986165 having a published selling price and which falls to be taken into account in the calculation of a person’s earnings shall be calculated or estimated by reference to the published selling price on the day in question.

Here “published selling price” means the lowest selling price published on the date on which the payment in question is made, and where no such price is published on that date, it means the lowest selling price published on the last previous date on which such a price was published.