No VAT will be charged on the hammer price, but VAT at 15% will be added to the buyer's premium which is invoiced on a VAT inclusive basis.
The footnote from Leonard Griffin should read:
This is one of the patterns for which we have a definite original name. The archive at Stoke-on-Trent holds a drawing showing the pattern on an 'Oct bowl' (Octagonal bowl) labelled 'pattern is Morroco' (sic). The drawing dates from 1929 and shows a colourway in just orange and black. Now, the appearance of this rare pattern on a Conical teaset shows it was also produced in colourway of black orange blue yellow. Note that the pattern is also on the saucers, a practice the factory phased out on most production ware shortly after this, but it was done occasionally on samples.